Calendar plugin for wordpress site

Status as of 2026-03-31 when codex credit ran out:

1. Removal of plugin did not work. Need to set all files owner to www-data.

2. Deletion of event in ui doesn't delete event in thunderbird

3. Cannot subscribe to an empty calendar in thunderbird

4. Click inside month cell doesn't add event.

5. Login pane hidden under website hero/banner image

6. Updating an events description via caldav creates weird sequences, e.g. a space ends up as: text/html,%C2%A0":