Here we have a beautifully framed, 18"x12," Hollywood, California ad from 1968 featuring Janis Joplin, Big Brother & The Holding Company, Rhinoceros, and lightshow upcoming (back in 1968). This ad is an original, not a reprint. Ad shows slight aging which is not unusual for an ad over half a century old.
Some interesting stuff in the ad like available at all Wallich's and Mutual Agencies, etc.