If I want to join a slow pitch softball team, do I have to head down there and sign up?

Go to front building they give you more info...

Yes go down there go to the office and tell him you want to sign up and for what you want to sign up for girls softball guy softball co-ed softball whatever you want you're the one paying for it you get what you pay for but yes they have multiple leagues and levels to play at so you can pick when you get there just take your credit card but I'll tell you one thing it'll be well worth it where else can you play a softball game in Yankee Stadium Fenway Park

Try social media to see if anyone needs more teammates. The team I am on is a bunch of coworkers. You can always head down there and see if you can join a team.