The first time I had work in a public space it felt very strange to see people that I didn't know looking and, and presumably commenting on, my work. Nowadays, I'm a bit more fatalistic - they either like the work or they don't and there's not a lot I can do about that. The trick seems to be not to get too pissed on open nights so that I can answer any questions without making a fool of myself. Doesn't always work!