As a non-profit organization dedicated to promotion of general aviation in Canada's north, the Northwest Territories Flying Association uses Zeffy for both membership management and event planning. We've found it super easy to offer tickets to both free and paid events and appreciate the ability to send automated reminders and messages/documents to participants. The ability to include mandatory custom questions in ticketing forms is a game-changer for us since it allows the collection of information that could prove lifesaving in the event of an aviation emergency.