Activity for FutureMrsJenkins

What is a nice way to inform people that we do not expect them to sit on the "grooms side" "brides side"? I see a lot of cute little poems. I want it to be nice. Not necessarily cute.

We are considering doing open seating for our reception and I wanted to see if anyone else is doing this as well. If so, how are you setting it up? Are you placing a sign out to let the guest know?