➜ Downloads i3-agenda
Traceback (most recent call last):
File "/usr/bin/i3-agenda", line 8, in
sys.exit(main())
File "/usr/lib/python3.8/site-packages/i3_agenda/init.py", line 97, in main
events = getEvents(service, allowed_calendars_ids, args.maxres,
File "/usr/lib/python3.8/site-packages/i3_agenda/init.py", line 147, in getEvents
all.append(Event(event['summary'], is_allday(start_time), unix_time, end_time))
KeyError: 'summary'

Looks like some commit broke it cuz it used to work for me on Manjaro i3. After adding a summary field, it works again.