Welcome to our forum.
All's I can tell you is the following links:
That last link is our own Dating & Friendships subforum on this site. As for OKCupid, the idea is to write up a personal profile that clearly states you're interested in a poly relationship. OKC is pretty poly-friendly, and a lot of people have had good luck there, though not all.
I'm pretty sure Austin has a large poly population, but I don't know how organized they are (as far as get-togethers and that). You'll have to do some research. Try googling "Austin polyamory" and see what might come up. You could even try a search (or tag search) on Polyamory.com for the word "Austin."
Good luck in your searches, and I hope you'll have a look around here on Polyamory.com and see what threads and ideas call to you.