Make a cold introduction
You could strategically situate yourself and re-situate yourself around a guy you find attractive, hoping he’ll notice you as you put your hair up, then let it back down, unbotton your top button, etc. OR you could walk straight up to him, stick out your hand and say, “Hi. I’m insert name here.” If the guy was ever going to be interested, you’ll find out then and there. He’ll either be thrilled that you minimized the work for him and impressed with your assertiveness, or he’ll let you know he’s married/gay/not interested. And you can skip waiting an hour of game-playing to discover that.