We actually tried to set a new world's record at a (for the week) gay nudist campground in the Poconos several years ago. Not sure if we succeed or not but there were LOTS of guys.
I don't mean to pour cold water on the idea (we all know what COLD water does) but it was much better in theory than in practice. For one thing the circle was so large, that the guys across the circle from you were so far away so it wasn't all that hot seeing a guy in the distance jerk off. I don't think it was the size of a football field, but was definitely bigger than a tennis court. Maybe the size of a baseball diamond -- hard to remember. (300 guys?? Something like that. Were any other LPSG-er's there?) Anyway........it wound up that you just watched the guys to your left and right as you jerked off because the guys across the circle from you are too far away from you when the circle gets big beyond a certain point. None of us thought about this until we were actually in the circle and saw how big it was which is why I say it sounded hotter in theory than in practice.
NEVERTHELESS, I encourage everyone to do this and be part of setting a NEW world's nudist record!! Something to tell the grandkids years from now.
(You are doing it in the nude I hope? Otherwise I don't know that there would be a certifying authority to report it to. Although you didn't mention going for a record, we just had the Olympics so.......) | 
I'm in Philly.
