A Laundry Night must take place on the weekend in lieu of other, what some would consider, more fun activities. But, of course, nothing could be more fun than a laundry night. Laundry Nights are awesome.
Sonia: Are you going to that party tonight?
David: No, I think I'm going to stay in and have a laundry night; who needs another fraternity party when my socks have been stinking up my room for weeks?