My fiance and I are getting married outside this Sept. on a site that overlooks a lake. The last outdoor wedding I went to didn't use wireless mics and it was fine, but it was also more shelterd are and a smaller crowd. We are having 220+ people and I'm concerned they might not be able to hear. Should I get a wireless mic? Can you rent them? Where can you find them? Neither our ceremony site nor pastor has one on hand.