Our club went on it's first every night ride downtown. It started with pretty good relative light, but by the time we were done it was pitch black out.
We moved our rides from the county roads, to town becuase of the slower traffic and the use of available street lights. Overall it was a hoot.
Right now I'm setting my MTB up with lights and slicks, reason being once it's dark missing potholes will be harder so the MTB will have no trouble with the front suspension and stuff.
It was so fun, we are planning a weekend night ride down in Nashville and maybe some other major cities. It really was fun.