Here are the local entertainment papers, check it out now, and the friday before you go for the latest. http://www.citypaper.net/http://www.philadelphiaweekly.com/
here is an activity group that you can join or use to get ideashttp://www.meetin.org/city/MEETinPHI...ADELPHIA&Rem=1
another source www.phillyfunguide.com/funsavers
I am not sure what your interests are, but I guarantee you, you will find it in philly and then some. There is plenty to do at anytime of the year.
IF you don't want to plan ahead, when you get here, get one of the local papers the Phila weekly, or city paper, (links above) out of the yellow or orange boxes, they are free, and you will find something to do.
They have restaurants of every etnicity you can imagine, there are professional sports, tons of movies, plays, clubs, bars, churches.
Anymore questions, let me know. Where areyou staying, maybe we can meet?