BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CyrusIMAP.org/Cyrus 
 3.9.0-alpha0-85-gd6d859e0cf-fm-20230116.001-gd6d859e0//EN
BEGIN:VEVENT
CREATED:20230109T084023Z
LAST-MODIFIED:20230119T110732Z
DTSTAMP:20230119T110732Z
UID:56cdc4dc-11b7-407c-86c6-9faedfc28afb
SUMMARY:My repeating event
RRULE:FREQ=WEEKLY;BYDAY=TH;COUNT=20
RRULE:FREQ=WEEKLY;BYDAY=TH;COUNT=20
DTSTART;TZID=Europe/London:20230112T100000
DTEND;TZID=Europe/London:20230112T120000
END:VEVENT
END:VCALENDAR