My suggestion would be that you follow the steps to become a Friend of BAFS now. Then you can check back January 1 and see whether we’ve hit the 250. If we haven’t, you can register then. (Nothing in registering as a “Friend” will create a problem in registering for a team later.)
Also, if you decide not to register, I would suggest using the contact form to indicate that you are willing to be on a team if you are needed. Even if we hit the 250, we always have some people who sign up and then never join their team, or who get injured during the season, so we always like to have some in reserve as replacements. (I’m not the one in charge of team placements, but the contact form will notify the people who are.)