New contacts from events

Hey! 

At an event, created from event manager in market, new as well as old contacts can sign up and the new contacts are created as new leads sign in to the event.

We do not want to keep the new leads that is created as we do not have the rights to keep them, GDPR, and there is so much data that we do not want to save the history around. Is there any good way to delete these new contact being created?