You can now connect a Google account to Keeper.sh by signing in, then pick which of its calendars Keeper.sh reads. Before this release, reading a Google calendar meant finding its secret iCal address, a link that is hard to locate, easy to leak, and only revocable by regenerating it.
Signing in lists the calendars on the account by name, so choosing between your own calendar and one shared with you is a matter of ticking the right box.
A calendar can now be both a source and a destination without feeding itself. Keeper.sh recognises the events it created and skips them when reading, so two accounts pointed at each other get one copy in each direction instead of a loop that grows on every run.
The two-way work and personal setup shows how to connect two calendars in both directions.