Original 1st printing (Bindweed Press) 14&1/8 x 19&7/8" concert/event poster for "THIS IS IT- Psychedelic Happenings Are Here", a show held at the Regency Ballroom of the Leamington Hotel in Oakland, CA on 2/10/1967, featuring appearances by the Sparrow (an early version of Steppenwolf), along with the Immediate Family, the Wildflower and the Living Children. Art by Stanley Mouse and Alton Kelley, image is featured in the Art of Rock book on page 211 (plate 2.261). Medium flat vellum stock poster is in very good to absolutely fantastic mint/near mint to near mint (A/A-to A-) condition; aside from a slight pinch bend in the top center margin and a tiny bend in the bottom left margin, a cleaner/sharper example I have not seen. Classic 1st printing 1967 Mouse/Kelley image from the Art of Rock book with eye-searing colors and a very tight design.