Dress Your Dancers
One of my FAVORITE mitzvah ideas is to dress the MC, DJ and Dancers in T-shirts with the event logo. Often times this is just a matter of ordering a few extra "favors" and then the expense is minimal. Even if you are not doing a t-shirt favor, it is not expensive to order a dozen or two t-shirts for your entertainment staff. Logo t-shirts are also great for bartenders, servers, and even the photographer. Just another way inexpensive and easy idea to "brand" your mitzvah celebration.