The hackathon page says that there will be a few hours to form teams before the event starts.
I'm wondering if that usually works. I don't know anyone in the area, and I'm not sure if it's a good idea to show up without a team.
I've participated in and hosted a number of hackathons and I always see organic teams for at the event. It will help if you can convey to potential teammates that you can plug into a team well IE: knowledge in a language/tech/skillset and knowing how to use version control, etc.
Not all hackathons are the same but they are a lot of fun and a great opportunity to learn new things and meet new people. Have fun and good luck!
It wasn't a hackathon, but I found my current colleagues for a challenge.gov app challenge through twitter search (one guy tweeted seeing if any of his followers knew a specific API and I responded) -- now we are in business together.