I work during the week, so I won't be able to make it. However there are several in our group that visit during weekdays.
And what do you know, as I'm typing this right now while sitting on my deck, the Super Guppy just flew over my head on its approach to Rwy 27R. So you may see some interesting traffic.
We also have our own website which can be found with a simple internet search. Regular PHL
spotting reports are found on that site.