Issue Summary

I've set up CalDAV integration with a few calendars from my Nextcloud server. Now, when scheduling a call, loading availability for a given day takes very long (up to 30s):

When using the "troubleshoot availability" option for a given date, the view contains event from 2 years ago:

This leads me to suspect that calendso downloads and checks all the events in the calendar, not only those affecting a given day, making it quite slow.

Steps to Reproduce

1. Connect CalDAV calendars with a lot of events
2. Open the call scheduling form
3. Click on a date
4. wait...

Any other relevant information. For example, why do you consider this a bug and what did you expect to happen instead?

Technical details

• Browser version: Firefox 91 (dev edition)
• Node.js version: 14