BEGIN:VCALENDAR
VERSION:2.0
PRODID:collective/icalendar
BEGIN:VEVENT
DTSTAMP:20221108T080105Z
DTSTART:20220101
UID:636a0cc1dbd5a1667894465@icalendar
SUMMARY:Event with bare string as argument for categories
CATEGORIES:Lecture
END:VEVENT
END:VCALENDAR