Donations can be accepted in addition to public purchases and registrations. To set up an event to allow donations, select the event, then Event Settings > Donation Settings > On. A message must be composed, and will appear on the registration page for the event.
Suggested amounts can be added, and Custom Amount allows your guests to enter the amount they would like to donate.
Donations appear under Event Info > View Purchases/Process Refunds, and in reports. In reports, no ticket type is associated with a donation.