If you have an unwanted calendar appearing in Cupla, here's what to do:
Tap the menu icon (☰). Depending on your app version, it will appear either in the top-left corner of the Home screen or in the bottom-right corner of the tab bar.
Tap Calendar Settings.
Tap Calendar Connections.
Untick any calendars you do not want synced to Cupla.
If you cannot see the calendar in the list, scroll all the way to the bottom — it may be listed under Other Calendars.
Tap Save.
Please allow up to 20 seconds for the changes to take effect.