Instant Location Portraits for parties

Anyone have a business model or want to brainstorm with me on how to setup "Instant Location Portraits"?

I'm talking about setting up a highschool dance or business party and having the print ready by the end of the night.

I can imagine having my camera tethered to a laptop and sending the print job to chain of inkjet printers. I would then have sleeves ready for packing.

Questions....hot lights or strobe? Do you make money per prints sold? or does the organization pay you for being there? Do you need a claim ticket or do you have them recognize themselves on the print on the display?

I've been asked to do this a number of years ago but turned it down cuz I didn't have a business model.

BTW, I hate inkjets. I can't imagine relying on them.

What say you?