How many guys are up for a Gangbang? A couple of well known Providers would come to Cleveland (hell maybe even a local provider would do it for us) if enough guys were to participate.
A way to keep your identity secret is as follows:
Staggered start times with a halloween mask provided by the provider. For example the first guy comes in at 1:05 pm (sharp) the provider then gives him a mask. the second guy comes in at 1:10 sharp the provider then gives him mask, etc. Thus, you are only known to the Provider.
At the end of the session everyone dresses and staggered departure times are in effect. First guy leaves the room with mask on, quickly closes door, removes mask and hops on elevator or down stairs.
More than a few well reviewed Providers are up for a gangbang and they are EVEN turned on by it.