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The mega-event cache is a type of geocache.
"A Mega-Event cache is similar to an Event Cache but it is much larger. In order to qualify as a Mega Event, the event cache must be attended by 500+ people. Typically, Mega Events are annual events and attract geocachers from all over the world."
Many Mega-events start as a much smaller event. If held regularly, word of mouth and advertising will bring the attendance numbers up. Once the event reaches 500 attendees, or will potentially reach 500 attendees at the next scheduled event date, event organizers can contact Groundspeak about having the event made into a Mega-Event.