It's every Thursday night, year-round, 6:30 rollout from Schlotzky's across from Medical City.  Lights required.  Rolling pace around 16MPH, no drop.  Typically 6-10 people.  Some rough streets, especially downtown.  We do 1-1/2 loops of downtown, going through Deep Ellum, and dodging busses on Elm street going west, but the downhill and traffic light synchronization mean that we do Elm at ~25 mph.   One break, at AA center, for bathroom use at the bar on the corner.  Typically back to the parking lot by 9:15.

I'd suggest a trike, not a velo, due to occasional climbing.