Deprecated! In the lastest version, this property is ignored and the new registration system is used by default.
Setting to true will use the new registration system where the user must fill out a form to register for an event. The registration sub-collection should be configured first.
If the value is false or not specified the user can simply obtain a ticket with a click of a button, if the ticketTypes sub-collection has been configured.
Will default to true at some point in the future once the old system is removed.
