You can sign up here (thanks Emma):
This one doesn’t have a cap as to how many can attend.
They offer another open house in the fall.
High School of American Studies is off the same subway stop. I did the spring tour with both my kids and both said the commute was too much for them so we didn’t go up to see American Studies. That’s the kind of thing to keep in mind. For some kids a long trip every day isn’t an issue, for others it might be a deal breaker.