This is the best advice anyone could give about anything. Where you go is always less important than how you go, what you do when you're there, and how you leave. I think this kind of "attitude adjustment" (let's face it, we all need one now and then) is especially critical when we are hoping to meet people to fill the special places in our lives.
It doesn't matter so much where you go, but for goodness sake, just go! Contrary to popular wishes, significant others won't come knocking on our door seeking us while we are sitting on the couch with a remote in one hand and bag of chips in the other. Get out of the house!
Once out of the house, focus on ejoying yourself and the people around you. We all like to be around people who are smiling, laughing, warm, at ease, courteous and confident. It's not easy to be any of these things when every social excursion is a "mission" to find a significant other. I know it sounds trite, but I really do find it easier to adjust my attitude by easing back and not always thinking about finding a significant other. I inevitably meet more people when I focus on enjoying myself. I also get the added benefit of having a much better time.
If there is someone "in the room" who might be a good match for you, the best way to meet them is to be open, positive and socially engaging--no matter what "room" you're in. signature.