Ask the hosts of the last orgy you attended. They should have some tips. They might even have some towels that you can borrow.
Call it an eyes wide shut party and hope everyone doesn't just show up in masks instead. You should watch an episode of party down called Nick DiCintio's Orgy Night. That's basically what happens in it, sooooooo funny!
Google "organize orgy" There are a lot of hits, some focus on "how to choose a guest list" questions, others on the decor and music, others on the physical aspects (e.g. how many condoms to provide).
I just use paper strips and tie flyers to red light poles. It says "come gang bang my holes" with tear off phone numbers and addresses.
