A Linux users group meeting.
A homebrewing/zymurgy club.
A family reunion, unless you're from West Virginia.
The Michigan Womyn's Music Festival. Really, any event with "womyn" in the name.
A ham radio convention
Any bar with a name like The Back Door, The Bolt, Buddies, The Tool Box, The Shaft, The Ramrod, The Tunnel, The Cockpit, Bronco's, The Manhole, Members, Choices, Family, Different Strokes, The Village, or The Rainbow Club.
A college chastity club.
A Warhammer tournament.
Anyplace referred to as "the jobsite."
A Ross Jeffries "speed seduction" seminar.