Plotter: Wrong date
This event is listed as "Friday, 1 November: https://radar.squat.net/de/event/koln/plotter/2019-11-01/antiatomplenum-koln
But the repeating rule on Plotter is "Repeats every month on the third Thursday" So that should be 21 November.
https://plotter.infoladen.de/node/2615 https://plotter.infoladen.de/calendar-node-field-datum/month/2019-11?field_datum_rrule=1