Most event organizers will make tickets available on the day of the event, assuming that the event is not sold out. If you have reason to believe that an event may sell out then do not wait until the day of the event to purchase your tickets. To be certain that an event organizer plans to sell tickets on the day of an event you will want to reach out to the event organizer. Contact information for an event organizer is under the map on an event's web page.