The Tulsa Wednesday Night Ride is a 20 year (or more) tradition. Ready to roll every Wednesday night during Daylight Savings time (March - November).
While the up to 200 riders trickle in from various starting points, the main group leaves from 21st and Jackson in the River West Festival Park. Cyclists of all abilities show up for this one; BUT the front hits it hard and fast.
Tulsa Bicycle Club has route maps for the Wed Ride, as well as other resources.