Question: Why do you need to create a ticket to an event that is free of charge?
Answer: The ticket is here just a technical term. Every event needs at least one ticket for a registration and also a corresponding form for the that ticket. If your event is free of charge, you can name the ticket for instance Attend or Register and do not add other information to the ticket. The form will ask the registrant always at least first name, last name and email address. Read more about tickets from here.