Anybody know who organizes the Sunday afternoon group ride through Shelby?

Encountered them in Shelby Bottoms between 2-3PM this past Sunday (2/8), lovely group! It was nice to see such a large and diverse collection of riders.

That said, anyone know who organizes it? Would like to pass on the message that they may want to ride single-file on the narrower sections of greenway. Two (and three, in a couple cases) abreast for a big group (easily 40-50) like that is less than ideal.