A Red Tent Party (named for the book The Red Tent, which features the Biblical character Dinah) is a party held in honor of a girl's first period. Uterus and period-blood themed food and decorations are appropriate.
Janet: So, my daughter finally got her first visit from Mother Nature last week; now we get to host her Red Tent Party!
Bill: Red Tent Party? What the hell, Janet, that's disgusting, you're one of those ultrafeminist nazi-types, aren't you?