We've had similar situations at every venue where there are single men allowed in. The worst experience for us was Bay City Santa (now closed) where I had to literally fight to get a door shut, and push arms back from grabbing my parter because of the press of guys outside.

That being said, we do sometimes enjoy going to events/venues with single guys and we simply approach it with a different mindset and a different way of interacting: I tend to actively engage with guys who cluster in hallways or follow along behind us asking them not to be so creepy, and if we do engage in public or leave the door open, I am very proactive about what is or is not okay.

My experience with this (being more proactive about engaging verbally about our boundaries with guys) has almost always worked out well for us. Guys, once engaged, will often show themselves to be friendly, helpful and we've often had guys intercede with those who are going against our boundaries. Further, we've seen guys telling others to "move along" and to "stop trying to look into a closed room". This has proven to me that there are good guys in the scene, generally speaking.