Although best experienced in concert over some sort of holiday — amid festive Christmas lights, not-so-distant firecrackers, or a crowd of costumed Halloween revelers — Bobby Conn creates his own occasions. A seasoned performer who's been in the game for decades, his creative juices keep flowing even as his dementia increases with age. Whether tonight's palette features prog rock, politics, satire, or seduction, Bobby Conn's colors are like none you've ever seen.