Summer Group Exhibition was clearly thrown together at the last minute, but gallery director Robin Rule is such a pro that it was still excellent. Just by pulling stuff from storage, she was able to present a variety pack that rivaled the MCA's biennial. Summer Group Exhibition brought together several generations of Denver artists, from old-timers such as Dale Chisman, Clark Richert and Andy Libertone, who started their careers in the '60s, to newcomers such as Jason Patz, who wasn't even born until the 1980s. Filling the gap were mid-career talents Jeff Starr and Mary Ehrin. This generational inclusiveness was the best part of the show; it demonstrated that Denver's contemporary art world has legs and roots. As does Rule, who closed the Broadway gallery but will be back.