We have a couple of hotel parties in our area that cater to this. One is for women that specifically want BBC, but it's not a party we'd go to. The guys are supposed to sit on the sideline while the BBCs use their women. Great if you have a BBC cuck fantasy too, but we don't.
The other party we do go to can be set up as a 2-girl GB on request. Two girls because if only one and she gets cold feet, party's over before it starts. They have regular parties too that tend to be guy heavy and there have been times where the Mrs has had a cock in her hand, mouth, and pussy while the guys rubbed her all over and pinched/sucked her nipples, etc. She was in heaven and I was on the next bed playing with another girl watching it all. Is always fun, but then I enjoy seeing the Mrs have a good time as much as anything I'm doing. Funny that way...lol
We now know enough people that we could set up a GB at our house if we want, but the Mrs has already experienced this a number of times and probably will again. I will say that, at least in this situation, it's not like people would imagine. There aren't "a line of guys" waiting to do her. Sometimes it works out that she has the attention of 2-4 guys at once. She plays, takes a break, and maybe plays some more with one or more guys if she wants.
The Mrs toy box full of boy toys has come from attending parties. At our last party we invited 5 single guys to join in. These are all guys we know that are not only respectable, we KNOW they can perform in that kind of situation. People might be amazed at how many guys can't.
Anyway, if anyone is still actively trying to set one of these up my suggestion would be to go to lifestyle parties that allow single guys where you can meet and talk in person, and sometimes see if and how well they perform if they play in a public room. If they can do that well they're probably what you want.
One other thing. When we first started doing full swap I had no problem letting the Mrs test drive new boy toys. Of course everyone goes for the eye candy at first. What we found is those tend to be guys that think they're "all that" and can not or will not perform. We probably have at least 50+ guys we know in our circle of friends and if I had to pick the top best 3 performers, sorry to say ladies but they would all be just over 60 years old.
They have the patience, experience, and if they take care of themselves, stamina to give the Mrs what she wants. I have seen these guys bang the Mrs for nearly an hour straight. For most of the eye candy guys, you're lucky if you get 10 mins, and that includes stripping/dressing. Just something to consider, depending on what you want out of this. I know that I'd want guys that are there with pleasuring the Mrs being their main goal versus some pretty boy that's there to get his rocks off.
PS - If anyone local really wanted to do this feel free to drop me the bird and we could probably set something up so long as you're reasonable HWP. We LOVE helping others with their fantasies when we can. Just our way of giving back to the LS that we're still enjoying the hell out of.