There is this official Google Calendar (ics).
These Google accounts have access to manage permissions (and make changes to events):
- edolstra@gmail.com (@edolstra)
- tomberek@gmail.com (@tomberek)
- valentin.gagarin@gmail.com (@fricklerhandwerk)
These Google accounts can only make changes to events:
- silvan.mosberger@moduscreate.com (@infinisil)