Board Thread:Support Requests - Getting Technical/@comment-25554800-20160729110528/@comment-24473195-20160729120814

TK-999 wrote: Based on https://support.google.com/calendar/answer/41207?hl=en, it should be doable with custom JS that inserts your calendar's embed code where appropriate. That would surely require a security review, and will require storing private information, so I'm not so sure that it will pass a security review. It is worth a try if the OP knows javascript.

Edit: It seems to generate a public hash, so it is probably better than the widget extension in that regard.