There are many Star Trek fan clubs, among the largest being STARFLEET International and the International Federation of Trekkers. Some Trekkies regularly attend Star Trek conventions (called "cons"). In 2003, STARFLEET International was the world's largest Star Trek fan club; as of January 1, 2020, it claimed to have 5,500+ members in 240+ chapters around the world.STARFLEET Database, CompOps, Fleet Strength
