I work for caterers, planners and other clients that will NOT allow any visual advertising by me at all. They run the event, they get the Kudos. I once had a pair of speakers with my name painted on it ... a client insisted that I face them away from the audience. Tough lesson for a young buck....I never tried that again. I pass out cards, and do my shmoozing on breaks, but the "gig" belongs to the host.