How can I bring in lots of people for a charity event?

I am doing a St. Baldricks Charity event at a local bar. I am looking for a way to help bring in some people. So far I have contacted many local business to hang posters in windows, and I have talked to some of the local police and fire depts.
The event is next month, and I really need some assistance, and some ideas to help me raise some money for a good cause.