Taking things a tiny step further, you can forgo table numbers and use song titles instead. When the DJ plays that song, it can signal that table to eat. It can also work to get everyone up on the dance floor. When the DJ plays the song that entire table must get up and dance!
Choosing a last dance song for your wedding is a great way to round off and finalize the perfect evening. Many venues have curfews on how late your reception can carry on for and often they have very high overtime fees.