We had a pool party/BBQ at one sister's parents' house and we did a trip to the zoo one year. Not sure either of those will work for CT in the winter though!
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From the SigmaTo the K!
Polyamorous, Pansexual and Proud of it! It Gets Better
We rented a room in a nice hotel by campus. We had a buffet and played get-to-know-you games. It was really fun and good for the new girls to get to know one another!
Is there indoor mini-golf near you? One of the nice things about bowling or mini-golf, IMO, is that you divide up into smaller groups of 4-6. This is nice for the PNM's that can be overwhelmed by trying to meet everyone at once.