To modify event form, follow these steps below to modify the form for customization:

1. Modify the event form UI file 
   /server/html/event-create.html.php
   to include any additional input one would like to include on the event form. 
   
2. Edit event class  
   /server/classes/cls_events.php
    class, in which save and edit event functions as 
   saveEvent()
    and 
   editEvent()
   . Keep in mind that an event data is passed as a simple array.
   
3. Those two functions
    saveEvent, editEvent
    are called in 
   /ajax/event_manager.php
   
   
4. Lastly, be sure to modify the database event table to include any additional data.