Create a buddy system on the floor. Set up a table in the lobby or near a floor exit and as people go by ask them a question relating to a health issue. Learn and have fun at the same time. This is better than lip-synch contests, because contestants have to actually sing. It's called Headphone Singing.
Contestants choose their song, put on headphones and sing along.
Those people in the audience get a pretty good show. Prizes for the winners, of course. This is a fun, quick program that gives people something to do. Get someone to play Jerry, pick an issue about relationships, or sexual decision-making or even alcohol use, get a few volunteers to play the part and then see what happens. Things may get a little crazy, but people will attend, have some fun, and then you can pass out information after you are finished.