Don't worry about "singles" vs. "non-singles." If your goal is to broaden your set of acquaintances, it really isn't going to matter. One of the best things about going to events at communities like this is the ability to meet a broad mix of people, all with at least one thing in common. And, if you're really looking for "someone," who knows which old married person might know exactly who that "someone" is!
I have been on a different site, different topic, for six years now, and have been to many different events and organized my fair share, even in other cities. Several friends have come from that experience, people from a far wider variety of backgrounds that I was used to, none of whom would have ever met elsewhere. One of them pointed me at LTH as he knew I liked food as much as he does.
So, if you're up for it, pick a place here that you'd like to try and gets a lot of discussion, pick a couple of dates, go into the events thread, and start a thread.
"Fried chicken should unify us, as opposed to tearing us apart. " - Bomani Jones