congrats on getting into the program. i lived/worked in philadelphia for years (in fact, my last job was right next door and i lived 4 blocks away) so i'm familiar with the area. if you have any questions i can help with, i'll be glad to give you any info i can. it's a great neighborhood, i really miss living there.
as far as orientation goes, all i know is that it's on tues 5/22, a week before classes begin. i'm dying for more info but i can't seem to find much. I had to call to find out the start date.
if you don't mind my asking, are you coming from far away?