[x] Modify the test resources file (e.g tests/resources/{Exchange MIC}.csv), either manually or by executing python etc/make_exchange_calendar_test_csv.py {Exchange MIC}.
[x] Check if any of the fixtures in tests/test_{Exchange MIC}_calendar.py need updating to reflect your changes.
[x] Add references to any new/modified holidays in exchange_calendars/exchange_calendar_{Exchange MIC}.py.
Workflow to modify an existing Exchange Calendar
tests/resources/{Exchange MIC}.csv), either manually or by executingpython etc/make_exchange_calendar_test_csv.py {Exchange MIC}.tests/test_{Exchange MIC}_calendar.pyneed updating to reflect your changes.exchange_calendars/exchange_calendar_{Exchange MIC}.py.