I'm a Brit but was at a convention centre in Chicago this week for a trade show. One of the exhibitors hired a band to play from about 4pm onward (good too!) and to show support I stuck a supportive note where the bass player could read it - but I thought it would be nice if we had a recognition signal amongst ourselves - and no, NOT a hanky in a back pocket! So, you're at a gig and a band is playing - as you walk past the stage you want to show your support - but how? Any ideas?