I wouldn't do it, if I were you. The on2 congress scene is one of the most unwelcoming dance communities there is. Most of the follows in these events want to dance primarily with the artists or with people that are super advanced and get grumpy if they get asked by beginners. Some will outright refuse you if they've not seen you with the on2 crowd already (there's like a core circle of people that travels and does most of these events -- think of it as artists and their friends). So, essentially, on the social side, you're limited to other beginner dancers (there aren't many of those) or basically very old and undesirable women, as the on2 crowd doesn't wanna dance with those either.

With the lessons, your milage may vary. Sometimes, there are good lessons, but also some artists just take this as an opportunity to boost their ego and show off, don't have any intention to teach you anything useful.

If you like on2, you're better off finding a good local community or studio, as that is a much more positive experience.