It's been nearly 50 years since Woodstock turned festival culture into the monster that it is today. Tonight, the Rock Hall celebrates Woodstock's legacy at its monthly Rock Hall Nights. There will be Woodstock trivia and guests can see some Woodstock-related artifacts from the Rock Hall Library and Archives. There will also be a festival photo booth. It all starts at 6 p.m. and tickets cost $20 (but admission is free for Cleveland residents). (Niesel)