Hi Franky,
as suggested, see https://wordpress.org/support/topic/multibooking-event-check-event-selection-in-form, I would be very useful if eme would check in the booking form for multi-booking events if at least one single event was chosen (= at least for one single event at least 1 seat was chosen).
By the way, I noticed that if (for example) a wrong date is filled in, and eme asks for filling in a correct one, eme does not keep the selected seats (they are all changed to 0). Maybe this could also be corrected when implementing this feature.
Thank You
Best Regards
S