I am using the WP event manager and sell ticket, to User buying tickets from event. 

On my event submission form the organizer has the possibility to create paying ticket or free tickets. 

for each of them a lot of fields have been created by the plugin sell tickets.

I would like to ideally remove them but if they are mandatory at least to prefill them and hide them.

can you help me please? 

for instance end date is an unnecessary field for me , And I don't want the user to see it.