Command-line and Emacs Calendar Client
1- [x] list/search events
2- [x] add/remove events
3- [x] edit events
4- [x] timezones
5- [ ] really stress test the timezone handling -- this is full of gotcha's
6- [ ] don't load all calendars into memory to show only one event
7- [ ] support specifying duration
8- [ ] diagnose events failing to parse
9- [ ] [[https://github.com/robur-coop/icalendar/pull/13][handle RECURRENCE-ID]]
10- [ ] CalDAV syncing
11 - Currently, you can use [[https://github.com/pimutils/vdirsyncer][vdirsyncer]]
12- [ ] support querying times as well as dates
13- [ ] custom date/time formatting
14- [ ] support querying regex
15- [ ] support VALARMS
16- [ ] support VOTODS
17- [ ] support VCARDS
18- [ ] server mode
19 - and maybe hold =Event='s in-memory in a =Collection= instead of parsing them for every =Query=
20- [ ] implement TUI front end with something like [[https://github.com/leostera/minttea][minttea]]
21- [ ] implement an emacs client like mu4e