diff --git a/CHANGES.rst b/CHANGES.rst
index d399490a..05c67f86 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -29,6 +29,8 @@ Bug fixes:
 - Multivalue FREEBUSY property is now parsed properly
   Ref: #27
   [jacadzaca]
+- Compare equality and inequality of calendars more completely
+  Ref: #570
 - Use non legacy timezone name.
   Ref: #567
 - Add some compare functions.
@@ -36,7 +38,7 @@ Bug fixes:
 - Change OSS Fuzz build script to point to harnesses in fuzzing directory
   Ref: #574
 
-5.0.10 (unreleased)
+5.0.10 (2023-09-26)
 -------------------
 
 Bug fixes:
@@ -92,7 +94,7 @@ Minor changes:
 
 Minor changes:
 
-- Added support for BYWEEKDAY in vRecur ref: #268 
+- Added support for BYWEEKDAY in vRecur ref: #268
 
 Bug fixes:
 
@@ -104,7 +106,7 @@ Bug fixes:
 Minor changes:
 
 - Improved documentation
-  Ref: #503, #504 
+  Ref: #503, #504
 
 Bug fixes:
 
diff --git a/src/icalendar/cal.py b/src/icalendar/cal.py
index 0fd8ec2b..9bfed800 100644
--- a/src/icalendar/cal.py
+++ b/src/icalendar/cal.py
@@ -447,7 +447,7 @@ class Component(CaselessDict):
         return f"{self.name or type(self).__name__}({dict(self)}{', ' + subs if subs else ''})"
 
     def __eq__(self, other):
-        if not len(self.subcomponents) == len(other.subcomponents):
+        if len(self.subcomponents) != len(other.subcomponents):
             return False
 
         properties_equal = super().__eq__(other)
@@ -465,7 +465,6 @@ class Component(CaselessDict):
 
         return True
 
-
 #######################################
 # components defined in RFC 5545
 
diff --git a/src/icalendar/caselessdict.py b/src/icalendar/caselessdict.py
index c3671456..097dcd99 100644
--- a/src/icalendar/caselessdict.py
+++ b/src/icalendar/caselessdict.py
@@ -88,6 +88,9 @@ class CaselessDict(OrderedDict):
     def __eq__(self, other):
         return self is other or dict(self.items()) == dict(other.items())
 
+    def __ne__(self, other):
+        return not self == other
+
     # A list of keys that must appear first in sorted_keys and sorted_items;
     # must be uppercase.
     canonical_order = None
diff --git a/src/icalendar/prop.py b/src/icalendar/prop.py
index 131567f7..c7e7840a 100644
--- a/src/icalendar/prop.py
+++ b/src/icalendar/prop.py
@@ -145,6 +145,10 @@ class vBinary:
         except UnicodeError:
             raise ValueError('Not valid base 64 encoding.')
 
+    def __eq__(self, other):
+        """self == other"""
+        return isinstance(other, vBinary) and self.obj == other.obj
+
 
 class vBoolean(int):
     """Returns specific string according to state.
@@ -269,6 +273,7 @@ class vCategory:
         if not hasattr(c_list, '__iter__') or isinstance(c_list, str):
             c_list = [c_list]
         self.cats = [vText(c) for c in c_list]
+        self.params = Parameters()
 
     def to_ical(self):
         return b",".join([c.to_ical() for c in self.cats])
@@ -279,8 +284,24 @@ class vCategory:
         out = unescape_char(ical).split(',')
         return out
 
+    def __eq__(self, other):
+        """self == other"""
+        return isinstance(other, vCategory) and self.cats == other.cats
 
-class vDDDTypes:
+class TimeBase:
+    """Make classes with a datetime/date comparable."""
+
+    def __eq__(self, other):
+        """self == other"""
+        if isinstance(other, TimeBase):
+            return self.params == other.params and self.dt == other.dt
+        return False
+
+    def __hash__(self):
+        return hash(self.dt)
+
+
+class vDDDTypes(TimeBase):
     """A combined Datetime, Date or Duration parser/generator. Their format
     cannot be confused, and often values can be of either types.
     So this is practical.
@@ -290,7 +311,7 @@ class vDDDTypes:
         if not isinstance(dt, (datetime, date, timedelta, time, tuple)):
             raise ValueError('You must use datetime, date, timedelta, '
                              'time or tuple (for periods)')
-        if isinstance(dt, datetime):
+        if isinstance(dt, (datetime, timedelta)):
             self.params = Parameters()
         elif isinstance(dt, date):
             self.params = Parameters({'value': 'DATE'})
@@ -320,14 +341,6 @@ class vDDDTypes:
         else:
             raise ValueError(f'Unknown date type: {type(dt)}')
 
-    def __eq__(self, other):
-        if isinstance(other, vDDDTypes):
-            return self.params == other.params and self.dt == other.dt
-        return False
-
-    def __hash__(self):
-        return hash(self.dt)
-
     @classmethod
     def from_ical(cls, ical, timezone=None):
         if isinstance(ical, cls):
@@ -349,8 +362,11 @@ class vDDDTypes:
                 f"Expected datetime, date, or time, got: '{ical}'"
             )
 
+    def __repr__(self):
+        """repr(self)"""
+        return f"{self.__class__.__name__}({self.dt}, {self.params})"
 
-class vDate:
+class vDate(TimeBase):
     """Render and generates iCalendar date format.
     """
 
@@ -377,7 +393,7 @@ class vDate:
             raise ValueError(f'Wrong date format {ical}')
 
 
-class vDatetime:
+class vDatetime(TimeBase):
     """Render and generates icalendar datetime format.
 
     vDatetime is timezone aware and uses the pytz library, an implementation of
@@ -438,7 +454,7 @@ class vDatetime:
             raise ValueError(f'Wrong datetime format: {ical}')
 
 
-class vDuration:
+class vDuration(TimeBase):
     """Subclass of timedelta that renders itself in the iCalendar DURATION
     format.
     """
@@ -495,8 +511,12 @@ class vDuration:
 
         return value
 
+    @property
+    def dt(self):
+        """The time delta for compatibility."""
+        return self.td
 
-class vPeriod:
+class vPeriod(TimeBase):
     """A precise period of time.
     """
 
@@ -520,7 +540,7 @@ class vPeriod:
         if start > end:
             raise ValueError("Start time is greater than end time")
 
-        self.params = Parameters()
+        self.params = Parameters({'value': 'PERIOD'})
         # set the timezone identifier
         # does not support different timezones for start and end
         tzid = tzid_from_dt(start)
@@ -532,17 +552,6 @@ class vPeriod:
         self.by_duration = by_duration
         self.duration = duration
 
-    def __cmp__(self, other):
-        if not isinstance(other, vPeriod):
-            raise NotImplementedError(
-                f'Cannot compare vPeriod with {other!r}')
-        return cmp((self.start, self.end), (other.start, other.end))
-
-    def __eq__(self, other):
-        if not isinstance(other, vPeriod):
-            return False
-        return (self.start, self.end) == (other.start, other.end)
-
     def overlaps(self, other):
         if self.start > other.start:
             return other.overlaps(self)
@@ -574,6 +583,10 @@ class vPeriod:
             p = (self.start, self.end)
         return f'vPeriod({p!r})'
 
+    @property
+    def dt(self):
+        """Make this cooperate with the other vDDDTypes."""
+        return (self.start, (self.duration if self.by_duration else self.end))
 
 class vWeekday(str):
     """This returns an unquoted weekday abbrevation.
@@ -740,7 +753,7 @@ class vText(str):
         return cls(ical_unesc)
 
 
-class vTime:
+class vTime(TimeBase):
     """Render and generates iCalendar time format.
     """
 
@@ -814,6 +827,8 @@ class vGeo:
         except Exception:
             raise ValueError(f"Expected 'float;float' , got: {ical}")
 
+    def __eq__(self, other):
+        return self.to_ical() == other.to_ical()
 
 class vUTCOffset:
     """Renders itself as a utc offset.
diff --git a/src/icalendar/tests/america_new_york.ics b/src/icalendar/tests/calendars/america_new_york.ics
similarity index 100%
rename from src/icalendar/tests/america_new_york.ics
rename to src/icalendar/tests/calendars/america_new_york.ics
diff --git a/src/icalendar/tests/pacific_fiji.ics b/src/icalendar/tests/calendars/pacific_fiji.ics
similarity index 100%
rename from src/icalendar/tests/pacific_fiji.ics
rename to src/icalendar/tests/calendars/pacific_fiji.ics
diff --git a/src/icalendar/tests/calendars/pr_480_summary_with_colon.ics b/src/icalendar/tests/calendars/pr_480_summary_with_colon.ics
index 438c7011..96b69179 100644
--- a/src/icalendar/tests/calendars/pr_480_summary_with_colon.ics
+++ b/src/icalendar/tests/calendars/pr_480_summary_with_colon.ics
@@ -4,4 +4,4 @@ SUMMARY:Example calendar with a ': ' in the summary
 END:VEVENT
 BEGIN:VEVENT
 SUMMARY:Another event with a ': ' in the summary
-END:VEVENT
\ No newline at end of file
+END:VEVENT
diff --git a/src/icalendar/tests/time.ics b/src/icalendar/tests/calendars/time.ics
similarity index 100%
rename from src/icalendar/tests/time.ics
rename to src/icalendar/tests/calendars/time.ics
diff --git a/src/icalendar/tests/timezone_rdate.ics b/src/icalendar/tests/calendars/timezone_rdate.ics
similarity index 100%
rename from src/icalendar/tests/timezone_rdate.ics
rename to src/icalendar/tests/calendars/timezone_rdate.ics
diff --git a/src/icalendar/tests/timezone_same_start.ics b/src/icalendar/tests/calendars/timezone_same_start.ics
similarity index 100%
rename from src/icalendar/tests/timezone_same_start.ics
rename to src/icalendar/tests/calendars/timezone_same_start.ics
diff --git a/src/icalendar/tests/timezone_same_start_and_offset.ics b/src/icalendar/tests/calendars/timezone_same_start_and_offset.ics
similarity index 100%
rename from src/icalendar/tests/timezone_same_start_and_offset.ics
rename to src/icalendar/tests/calendars/timezone_same_start_and_offset.ics
diff --git a/src/icalendar/tests/timezoned.ics b/src/icalendar/tests/calendars/timezoned.ics
similarity index 100%
rename from src/icalendar/tests/timezoned.ics
rename to src/icalendar/tests/calendars/timezoned.ics
diff --git a/src/icalendar/tests/conftest.py b/src/icalendar/tests/conftest.py
index 0b1296b3..4a954a29 100644
--- a/src/icalendar/tests/conftest.py
+++ b/src/icalendar/tests/conftest.py
@@ -15,10 +15,16 @@ class DataSource:
         self._parser = parser
         self._data_source_folder = data_source_folder
 
+    def keys(self):
+        """Return all the files that could be used."""
+        return [file[:-4] for file in os.listdir(self._data_source_folder) if file.lower().endswith(".ics")]
+
     def __getattr__(self, attribute):
         """Parse a file and return the result stored in the attribute."""
         source_file = attribute.replace('-', '_') + '.ics'
         source_path = os.path.join(self._data_source_folder, source_file)
+        if not os.path.isfile(source_path):
+            raise AttributeError(f"{source_path} does not exist.")
         with open(source_path, 'rb') as f:
             raw_ics = f.read()
         source = self._parser(raw_ics)
@@ -40,20 +46,23 @@ class DataSource:
 
 HERE = os.path.dirname(__file__)
 CALENDARS_FOLDER = os.path.join(HERE, 'calendars')
+CALENDARS = DataSource(CALENDARS_FOLDER, icalendar.Calendar.from_ical)
 TIMEZONES_FOLDER = os.path.join(HERE, 'timezones')
+TIMEZONES = DataSource(TIMEZONES_FOLDER, icalendar.Timezone.from_ical)
 EVENTS_FOLDER = os.path.join(HERE, 'events')
+EVENTS = DataSource(EVENTS_FOLDER, icalendar.Event.from_ical)
 
-@pytest.fixture
+@pytest.fixture()
 def calendars():
-    return DataSource(CALENDARS_FOLDER, icalendar.Calendar.from_ical)
+    return CALENDARS
 
-@pytest.fixture
+@pytest.fixture()
 def timezones():
-    return DataSource(TIMEZONES_FOLDER, icalendar.Timezone.from_ical)
+    return TIMEZONES
 
-@pytest.fixture
+@pytest.fixture()
 def events():
-    return DataSource(EVENTS_FOLDER, icalendar.Event.from_ical)
+    return EVENTS
 
 @pytest.fixture(params=[
     pytz.utc,
@@ -71,3 +80,19 @@ def utc(request):
 ])
 def in_timezone(request):
     return request.param
+
+
+@pytest.fixture(params=[
+    (data, key)
+    for data in [CALENDARS, TIMEZONES, EVENTS]
+    for key in data.keys() if key not in
+    ( # exclude broken calendars here
+        "big_bad_calendar", "issue_104_broken_calendar", "small_bad_calendar",
+        "multiple_calendar_components", "pr_480_summary_with_colon"
+    )
+])
+def ics_file(request):
+    """An example ICS file."""
+    data, key = request.param
+    print(key)
+    return data[key]
diff --git a/src/icalendar/tests/test_equality.py b/src/icalendar/tests/test_equality.py
new file mode 100644
index 00000000..b491e372
--- /dev/null
+++ b/src/icalendar/tests/test_equality.py
@@ -0,0 +1,131 @@
+"""Test the equality and inequality of components."""
+import copy
+import pytz
+from icalendar.prop import *
+from datetime import datetime, date, timedelta
+import pytest
+
+
+def test_parsed_calendars_are_equal_if_parsed_again(ics_file):
+    """Ensure that a calendar equals the same calendar."""
+    copy_of_calendar = ics_file.__class__.from_ical(ics_file.to_ical())
+    assert copy_of_calendar == ics_file
+    assert not copy_of_calendar != ics_file
+
+
+def test_parsed_calendars_are_equal_if_from_same_source(ics_file):
+    """Ensure that a calendar equals the same calendar."""
+    cal1 = ics_file.__class__.from_ical(ics_file.raw_ics)
+    cal2 = ics_file.__class__.from_ical(ics_file.raw_ics)
+    assert cal1 == cal2
+    assert not cal1 != cal2
+
+
+def test_copies_are_equal(ics_file):
+    """Ensure that copies are equal."""
+    copy1 = ics_file.copy(); copy1.subcomponents = ics_file.subcomponents
+    copy2 = ics_file.copy();  copy2.subcomponents = ics_file.subcomponents[:]
+    assert copy1 == copy2
+    assert copy1 == ics_file
+    assert copy2 == ics_file
+    assert not copy1 != copy2
+    assert not copy1 != ics_file
+    assert not copy2 != ics_file
+
+
+def test_copy_does_not_copy_subcomponents(calendars):
+    """If we copy the subcomponents, assumptions around copies will be broken."""
+    assert calendars.timezoned.subcomponents
+    assert not calendars.timezoned.copy().subcomponents
+
+
+def test_deep_copies_are_equal(ics_file):
+    """Ensure that deep copies are equal."""
+    try:
+        assert copy.deepcopy(ics_file) == copy.deepcopy(ics_file)
+        assert copy.deepcopy(ics_file) == ics_file
+        assert not copy.deepcopy(ics_file) != copy.deepcopy(ics_file)
+        assert not copy.deepcopy(ics_file) != ics_file
+    except pytz.UnknownTimeZoneError:
+        # Ignore errors when a custom time zone is used.
+        # This is still covered by the parsing test.
+        pass
+
+
+def test_vGeo():
+    """Check the equality of vGeo."""
+    assert vGeo(("100", "12.33")) == vGeo(("100.00", "12.330"))
+    assert vGeo(("100", "12.331")) != vGeo(("100.00", "12.330"))
+    assert vGeo(("10", "12.33")) != vGeo(("100.00", "12.330"))
+
+
+def test_vBinary():
+    assert vBinary('asd') == vBinary('asd')
+    assert vBinary('asdf') != vBinary('asd')
+
+
+def test_vBoolean():
+    assert vBoolean.from_ical('TRUE') == vBoolean.from_ical('TRUE')
+    assert vBoolean.from_ical('FALSE') == vBoolean.from_ical('FALSE')
+    assert vBoolean.from_ical('TRUE') != vBoolean.from_ical('FALSE')
+
+
+def test_vCategory():
+    assert vCategory("HELLO") == vCategory("HELLO")
+    assert vCategory(["a","b"]) == vCategory(["a","b"])
+    assert vCategory(["a","b"]) != vCategory(["a","b", "c"])
+
+
+def test_vText():
+    assert vText("HELLO") == vText("HELLO")
+    assert not vText("HELLO") != vText("HELLO")
+    assert vText("HELLO1") != vText("HELLO")
+    assert not vText("HELLO1") == vText("HELLO")
+
+
+@pytest.mark.parametrize(
+    "vType,v1,v2",
+    [
+        (vDatetime, datetime(2023, 11, 1, 10, 11), datetime(2023, 11, 1, 10, 10)),
+        (vDate, date(2023, 11, 1), date(2023, 10, 31)),
+        (vDuration, timedelta(3, 11, 1), timedelta(23, 10, 31)),
+        (vPeriod, (datetime(2023, 11, 1, 10, 11), timedelta(3, 11, 1)), (datetime(2023, 11, 1, 10, 11), timedelta(23, 10, 31))),
+        (vPeriod, (datetime(2023, 11, 1, 10, 1), timedelta(3, 11, 1)), (datetime(2023, 11, 1, 10, 11), timedelta(3, 11, 1))),
+        (vPeriod, (datetime(2023, 11, 1, 10, 1), datetime(2023, 11, 1, 10, 3)), (datetime(2023, 11, 1, 10, 1), datetime(2023, 11, 1, 10, 2))),
+        (vTime, time(10, 10, 10), time(10, 10, 11)),
+    ]
+)
+@pytest.mark.parametrize("eq", ["==", "!="])
+@pytest.mark.parametrize("cls1", [0, 1])
+@pytest.mark.parametrize("cls2", [0, 1])
+@pytest.mark.parametrize("hash", [lambda x:x, hash])
+def test_vDDDTypes_and_others(vType, v1, v2, cls1, cls2, eq, hash):
+    """Check equality and inequality."""
+    t1 = (vType, vDDDTypes)[cls1]
+    t2 = (vType, vDDDTypes)[cls2]
+    if eq == "==":
+        assert hash(v1) == hash(v1)
+        assert hash(t1(v1)) == hash(t2(v1))
+        assert not hash(t1(v1)) != hash(t2(v1))
+    else:
+        assert hash(v1) != hash(v2)
+        assert hash(t1(v1)) != hash(t2(v2))
+
+
+def test_repr_vDDDTypes():
+    assert "vDDDTypes" in repr(vDDDTypes(timedelta(3, 11, 1)))
+
+
+vDDDLists_examples = [
+    vDDDLists([]),
+    vDDDLists([datetime(2023, 11, 1, 10, 1)]),
+    vDDDLists([datetime(2023, 11, 1, 10, 1), date(2023, 11, 1)]),
+]
+@pytest.mark.parametrize("l1", vDDDLists_examples)
+@pytest.mark.parametrize("l2", vDDDLists_examples)
+def test_vDDDLists(l1, l2):
+    """Check the equality functions of vDDDLists."""
+    equal = l1 is l2
+    l2 = copy.deepcopy(l2)
+    assert equal == (l1 == l2)
+    assert equal != (l1 != l2)
diff --git a/src/icalendar/tests/test_examples.py b/src/icalendar/tests/test_examples.py
index ad10e174..0c1c132e 100644
--- a/src/icalendar/tests/test_examples.py
+++ b/src/icalendar/tests/test_examples.py
@@ -1,11 +1,10 @@
 '''tests ensuring that *the* way of doing things works'''
 
 import datetime
-
 from icalendar import Calendar, Event
-
 import pytest
 
+
 def test_creating_calendar_with_unicode_fields(calendars, utc):
     ''' create a calendar with events that contain unicode characters in their fields '''
     cal = Calendar()
@@ -38,4 +37,3 @@ def test_creating_calendar_with_unicode_fields(calendars, utc):
     cal.add_component(event2)
 
     assert cal.to_ical() == calendars.created_calendar_with_unicode_fields.raw_ics
-
diff --git a/src/icalendar/tests/test_time.py b/src/icalendar/tests/test_time.py
index 27a2dad0..f2aa36c7 100644
--- a/src/icalendar/tests/test_time.py
+++ b/src/icalendar/tests/test_time.py
@@ -15,7 +15,7 @@ class TestTime(unittest.TestCase):
 
     def test_create_from_ical(self):
         directory = os.path.dirname(__file__)
-        ics = open(os.path.join(directory, 'time.ics'), 'rb')
+        ics = open(os.path.join(directory, 'calendars', 'time.ics'), 'rb')
         cal = icalendar.Calendar.from_ical(ics.read())
         ics.close()
 
diff --git a/src/icalendar/tests/test_timezoned.py b/src/icalendar/tests/test_timezoned.py
index 2f284f89..d5b33ac6 100644
--- a/src/icalendar/tests/test_timezoned.py
+++ b/src/icalendar/tests/test_timezoned.py
@@ -10,11 +10,13 @@ try:
 except:
     from backports import zoneinfo
 
+HERE = os.path.dirname(__file__)
+CALENDARS_DIRECTORY = os.path.join(HERE, 'calendars')
+
 class TestTimezoned(unittest.TestCase):
 
     def test_create_from_ical_zoneinfo(self):
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'timezoned.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'timezoned.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
 
@@ -46,8 +48,7 @@ class TestTimezoned(unittest.TestCase):
         )
 
     def test_create_from_ical_pytz(self):
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'timezoned.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'timezoned.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
 
@@ -269,9 +270,7 @@ class TestTimezoneCreation(unittest.TestCase):
     def test_create_america_new_york(self):
         """testing America/New_York, the most complex example from the
         RFC"""
-
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'america_new_york.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'america_new_york.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
 
@@ -307,8 +306,7 @@ class TestTimezoneCreation(unittest.TestCase):
         one RDATE property per subcomponent"""
         self.maxDiff = None
 
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'pacific_fiji.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'pacific_fiji.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
 
@@ -442,8 +440,7 @@ class TestTimezoneCreation(unittest.TestCase):
     def test_same_start_date(self):
         """testing if we can handle VTIMEZONEs whose different components
         have the same start DTIMEs."""
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'timezone_same_start.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'timezone_same_start.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
         d = cal.subcomponents[1]['DTSTART'].dt
@@ -452,8 +449,7 @@ class TestTimezoneCreation(unittest.TestCase):
     def test_same_start_date_and_offset(self):
         """testing if we can handle VTIMEZONEs whose different components
         have the same DTSTARTs, TZOFFSETFROM, and TZOFFSETTO."""
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'timezone_same_start_and_offset.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'timezone_same_start_and_offset.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
         d = cal.subcomponents[1]['DTSTART'].dt
@@ -462,8 +458,7 @@ class TestTimezoneCreation(unittest.TestCase):
     def test_rdate(self):
         """testing if we can handle VTIMEZONEs who only have an RDATE, not RRULE
         """
-        directory = os.path.dirname(__file__)
-        with open(os.path.join(directory, 'timezone_rdate.ics'), 'rb') as fp:
+        with open(os.path.join(CALENDARS_DIRECTORY, 'timezone_rdate.ics'), 'rb') as fp:
             data = fp.read()
         cal = icalendar.Calendar.from_ical(data)
         vevent = cal.walk('VEVENT')[0]