MS 150 City-to-Shore in September. Two days from Cherry Hill to Ocean City, NJ, and back. Or you can do one day on Saturday. If you like many thousands of people. Many thousands.
The Philly bike club's Scenic Schuykill Century is in August or September. The club also runs a one-day ride to Brooklyn, NY starting from various locations. Most people start from New Hope, PA. It's a great ride. I have done it almost every year since 1997 or so.