Here's what I was thinking...
Friday night - on your own (meet up later?)
Saturday - group tours (shopping, dining, museums) / Phillies Game (1:05pm) / on your own
Saturday night - group dinner (cheesesteaks??), then bar hopping?
Sunday - brunch? / on your own / day trip to Atlantic City?
If anyone has any other suggestions, or would like to help plan an event, please let me know.