Original 1st printing (*"blocked") 14 x 22&1/4" concert poster for the Grateful Dead appearing with Charlie Musselwhite and Petris at the Carousel Ballroom in San Francisco, CA from 5/30-6/1/1968.
Art by Alton Kelley, image ("Memorial") is featured in the Art of Rock book on page 179 (plate 2.160).
Medium-thin flat index stock poster is in very good to excellent (B/B+ to B+) condition; a soft 2&1/2" horizontal bend extending from the top left margin into the middle of the blocked "Friday", along with a series of soft pinch/handling dings (mostly along the top margin), a few light fingerprint smudges and a stray edge/corner ding or two, otherwise fine.
A very decent-looking example of this classic 1968 Grateful Dead image from the Carousel.
*This is the "blocked dates" version with the days of the week (Friday/Saturday/Sunday) at the top of the poster blacked out with magic marker (a good number of the existing examples that were distributed and hung up exhibit this trait).