Last fall, when the Denver City Council was debating an ordinance allowing mixed-age crowds at cabarets, Rock Island owner David Clammage — or, as his patrons know him, “Uncle Dave” — was a vocal advocate of allowing local venues to provide safe and exciting entertainment options for the under-21 contingent. With his weekly All Agez Ragez, Clammage puts his booking policy where his mouth is. Every Saturday night until 11:30 p.m., the dark and buggy LoDo nightspot opens its doors to patrons ages sixteen and up; those eighteen and older are invited to stay until closing time. The Saturday-night fetes regularly feature revolutionary local spinners, including the Postman, DJ Harlan and Dave Granger. This is no mere kids’ stuff.