When a group of friends or co-workers go out after hours to shady bars, strip joints or otherwise.
"Honey will you be home for dinner tomorrow night?" "Sorry honey, I can't, we got family night here at work, we are gonna see Bambi."
a night out with the gays, or a night designated as a "gay" night in a drinking establishment or club.
Wednesday and Sunday is family night at the bar. Don't go any other night its full of breeders.