what I got from Rideofsilence.org:

Houston
Contact: Chris Holmes <--Send email
Distance: 10 miles
Notes: This is a West Houston ROS. We will begin our ride from the 24hr fitness at Saums and Fry road just north of I-10. We will head south for about 5 miles and turn around and come back.
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Houston
Contact: John Lewis <--Send email
Distance:
Notes: Herman Park/ZOO Parking Lot
Ride Route: 1. Exit the Herman Park Zoo parking lot and follow Golf Course Drive to Caroline St. (on the east side of the Museum - designated bike route) 2. Turn right onto Caroline St. Follow Caroline to Alabama. Turn left on Alabama for one block then right onto San Jacinto Street and take San Jacinto into downtown. 3. In downtown, turn left on Congress and left again onto Fannin to return. 4. Exit Fannin with a left turn on Ewing Street then right onto Caroline St. 5. Turn left onto Golf Course Drive from Caroline St. and follow the Golf Course Dr. loop back to the Herman Park ZOO parking lot. Riders of all abilities are welcome to join the group. Several hundred are expected to participate this year. The ride rolls out of the parking lot promptly at 7:00 pm so be sure to arrive early