center city sips is great- lots of places do their own happy hours as well.
they have August 8th on the facebook one by the looks of it- I may be at the shore that week though so may not make it to that unless I get back here earlier than planned- we could always plan our own one or an alternate date for those who can't do the 8th though.
the 16th or 17th would work really well for me.
I'd recommend mixto (13th and spruce, I think) if you guys are looking for speciality drinks- they have great mojitos and sangria, bridget foys (3rd and south) is good as well for different drinks.
707 (707 chestnut st, I know creative name right?) just opened recently- I haven't been but it looks like a fun place to hang out
there are lots of standard bars/pubs all over cc- I'm a fan of tir na nog (its at like 15th and jfk, mostly because they have lots of outdoor tables and always seem to have rowdy soccer fans inside)