I work as a photobooth attendant at weddings. I felt compelled to write this list of advice for brides who order photobooths since I work a couple weddings per week. I encounter the same situations over and over again and inevitably, the same problems.
1. Make sure the Emcee makes an announcement about the photobooth at the beginning of the evening and points out where it is.
This is especially important if it's a large venue and the booth is tucked away in a corner. Have him say in the announcement "Open til 11 o clock" or whatever time it is booked until. When there is half an hour left on your photobooth time, have the emcee make another announcement reminding everybody.
Literally EVERY wedding I work at, someone strolls up 5 minutes after we're closed and complains, "but I havent' done any photos all night!" Once the booth is shut down, we can't turn it all back on again by flipping a switch- there's a million different wires and things to connect.