I've done some research to find a suitable simple program or app and have not found one yet. Most of the truly simple ones are targeted at restaurants/bars. There are some ticketing applications but they're aimed at theatres, etc. and nothing inexpensive at all.

Need to keep it super simple for the door sitters and am hoping to use a touch screen Android tablet as the interface. Would love to greatly speed up the tally and cash box/accounting process for the night, improve accuracy and potentially create single use volunteer passes on the spot.