A: Hi fabian12,

A Pro TidyCal account would allow up to 10 calendars to be integrated - which means you can enable up to calendars for reading. Enabling calendars for reading allows TidyCal to check those calendars for existing events and block them off. This prevents overlapping of Schedules between existing events and bookings made in TidyCal.

However, you would only be asked to select one calendar as your Primary Calendar. Your Primary Calendar is where all bookings made in TidyCal are added.

Hope that clears things up.