diff --git a/CHANGELOG b/CHANGELOG
index f62e90a7..c58c3e3c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -5,6 +5,7 @@ Unreleased
 - Dropped support for Django 1.11, 2.1 and 3.0.
 - Add testing for Python 3.9.
 - Add testing for Django 3.1 and 3.2.
+- Fix bug #508. Fullcalendar API filters cancelled occurrences.
 
 0.9.3 - 2019-10-31
 ==================
diff --git a/schedule/views.py b/schedule/views.py
index 83b38c13..7514e41b 100644
--- a/schedule/views.py
+++ b/schedule/views.py
@@ -434,7 +434,9 @@ def convert(ddatetime):
                 # make event start and end dates aware in given timezone
                 event_start = event_start.astimezone(current_tz)
                 event_end = event_end.astimezone(current_tz)
-
+            if occurrence.cancelled:
+                # fixes bug 508
+                continue
             response_data.append(
                 {
                     "id": occurrence_id,
diff --git a/tests/test_views.py b/tests/test_views.py
index 110a1f3d..00b0e383 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -600,6 +600,40 @@ def test_occurrences_api_fails_with_incorrect_date_string_formats(self):
         expected_error = "does not match format '%Y-%m-%dT%H:%M:%S'"
         self.assertIn(expected_error, resp)
 
+    def test_occurrences_api_filters_cancelled_events(self):
+        # create a calendar and event
+        calendar = Calendar.objects.create(name="MyCal", slug="MyCalSlug")
+        weekly_meeting_event = Event.objects.create(
+            title="Recent Event",
+            start=datetime.datetime(2021, 12, 27, 8, 0, tzinfo=pytz.utc),
+            end=datetime.datetime(2021, 12, 27, 9, 0, tzinfo=pytz.utc),
+            end_recurring_period=datetime.datetime(2021, 12, 31, 0, 0, tzinfo=pytz.utc),
+            calendar=calendar,
+        )
+        Occurrence.objects.create(
+            event=weekly_meeting_event,
+            start=weekly_meeting_event.start.replace(year=2021, month=12, day=27),
+            end=weekly_meeting_event.end.replace(year=2021, month=12, day=27),
+            cancelled=True,
+            original_start=weekly_meeting_event.start.replace(
+                year=2021, month=12, day=27
+            ),
+            original_end=weekly_meeting_event.end.replace(year=2021, month=12, day=27),
+        )
+
+        # test fails with date string time format not '%Y-%m-%d' or '%Y-%m-%dT%H:%M:%S'
+        response = self.client.get(
+            reverse("api_occurrences"),
+            {
+                "start": "2021-12-27T08:00:00",
+                "end": "2021-12-27T09:00:00",
+                "calendar_slug": weekly_meeting_event.calendar.slug,
+            },
+        )
+        self.assertEqual(response.status_code, 200)
+        expected_content = []
+        self.assertEqual(json.loads(response.content.decode()), expected_content)
+
     def test_check_next_url_valid_case(self):
         expected = "/calendar/1"
         res = check_next_url("/calendar/1")