[Plugin: Events Manager] Prevent Double Bookings – Different Locations Same Date / Time

if you can code, you can start with this snippet (paste in your theme functions.php)

function my_booking_restrictions( $result, $EM_Booking ){
  $my_categories = $EM_Booking->get_event()->get_categories()->get_ids();
  foreach($EM_Booking->get_person()->get_bookings() as $booking){
     $EM_Event = $booking->get_event();
     //get the event categories as above and do some comparing, if you want to say 'no':
     if( !$result){
       $EM_Booking->add_error('You cannot book in the same category');
       return false;
     }
  }
  return $result;
}
add_filter('em_booking_validate', 'my_booking_restrictions');

Thanks for this! I’d like to do something similar – prevent creation of an event if another event already exists in the same location and time. Can you provide a similar snippet?