The COTILLION is the ballroom dancing presentation, performed by the COURT. Typically made of three songs, 2 mins. each. Ballroom dancing includes the waltz (always!), cha-cha, salsa, swing, tango, foxtrot, or mambo. This usually happens after dinner, when the food has settled.
There could be as many COTILLIONs as you want, but keep timing in mind! Besides the ballroom dancing, extra dancing could be modern hip-hop or lyrical performances. If modern performances are considered, think about the audience and whether it would truly be appreciated.