Matrimolympic Games
A sports competition held between a team of bridesmaids and a team of groomsmen as a way to lay aside political and/or religious differences and bond as members the same wedding party.
"Why is that group of girls playing tug-of-war with that group of guys?"
"It's probably an event for the Matrimolympic Games of that engaged couple watching them."
"It's probably an event for the Matrimolympic Games of that engaged couple watching them."