Radio mikes are good, can be acquired fairly cheaply, easily passed around, no leads to get caught up in.... You can get little stands so they sit on the tables, or big stands to make them more obvious. Trouble is you could find yourself doing a 'Car 59' impression in the middle of a slow ballad...

"In 1846, on March, the 14th day" ckshshck "pick up at 38 Acacia Gardens, anyone deal?"

LTS