Can I sync other calendars other than Google Calendar?

Currently, the Calendar integration only supports syncing Google Calendar. However, we are working on adding support for other calendars (Outlook, Apple Calendar, etc.). In the meantime, here are a few workarounds: 

1. Use a Zapier integration to sync events from your non-Google calendar to Google Calendar
2. Subscribe to your non-Google calendar from your connected Google Calendar
3. Use an app like Reclaim to automatically add events in your non-Google calendar to Google Calendar