Right now, any changes made to the setting of "Maximum number of guests" allowed per time slot will not be applied to existing events.
This has caused confusion to users who experienced double-bookings, because the previous maximum number of guests was set to > 1 guest, then they had received a booking before they changed the setting to =1 guest.
Suggestion:
When users are adjusting the maximum number of guests (either increase or decrease it), a reminder message should pop up to show them that the change WILL NOT be automatically applied to existing booked events.
Maybe, they will have the option to apply the change to:
* existing booked events and future time slots
* future time slots only