From North Jersey:
Meet at the Molly Pitcher Service Plaza Mile Post 71.7 off the NJ Turnpike at 12:30pm, leaving at 1pm. The rest stop is just after Exit 8A on the Southbound side.
http://www.travelboards.com/turnpike/NJ/map.asp
Or another from North Jersey:
Meet at Vince Lombardi Service Plaza of 95/295 at 11:00am, leaving at 12pm. Mile Post 116 East / MP 115.5 West.
http://www.travelboards.com/turnpike/NJ/map.asp
From South Jersey:
Meet at the Tower Records on Rte. 38 next to Red Lobster, near Cherry Hill Mall. Time unknown, but this spot is about 30 minutes from Philly so 12:45pm or 1pm is probably a safe bet.
From Northern Virginia:
Meet at Pike 7 Plaza at 9:15am, leaving at 9:45am sharp. There is a Starbucks and a Panera Bread so you can get breakfast or coffee if you want. There are spaces in the parking lot near BB&T where there will be the most parking (the side of the parking lot closest to Pike 7).
From Lehigh Valley, Pennsylvania:
Meet at Firestone Tire Parking Lot, near Lehigh Valley Mall, Whitehall, PA at 12:00pm, leave by 12:30pm.