It's about a 90 minute drive but well worth it, on the 11th is the Iron Hill Twilight Crit. THe only amateur race is a 3/4 then there is a womens and mens pro race. It's held in downtown West Chester and there will be thousands of people lining the streets, even for the 3/4 race. More info can be found here -
http://www.ironhilltwilightcriterium.com/ It's a fast and furious race.