WEBCAL protocol allows a user to subscribe to a calendar with many events in your app.

The users calendar app will “ping” your calendar endpoint from time to time to get the updated events list.

Don't forget that the route to the calendar subscription path should not require authorization!

Episode source code: https://github.com/corsego/104-webcal-icalendar/commit/093302163c824ecd5aa42d9350c8f4c5543c567d
Text walkthrough: https://blog.corsego.com/icalendar-ruby

0:00 What are calendar subscriptions?
1:00 Webcal subscription demo
2:04 Create link to subscribe to calendar
5:16 It works!
6:00 Warnings and Summary