code: function(eventData) {
  
      if (!getConfig().disable_confirm_page) {
        showBookingPage(eventData)
      } else {
        $('.fc-event-clicked').removeClass('fc-event-clicked');
        $(this).addClass('fc-event-clicked');
        utils.doCallback('clickTimeslot', eventData);
      }
  
    }
docs: Clicking a timeslot