Ask HN: How would you go about meeting a bunch of new people IRL?

This is part of my social anxiety therapy. I am trying to come up with strategies to meet hundreds of new people over the course of this year. The goal is not to build friendships but to have substantial "in the moment" interactions. Obviously a party of some sort would be the ideal place because I could maybe manage four or five such interactions over the course of the evening. But getting invited to parties is kinda challenging for me since I don't have many good contacts where I presently live. So I need other ideas...