Pair of original 1st/only printing concert posters for (2) Bill Graham Presents "Day on the Green" multi-band events at the Oakland (CA) Stadium

a 12 x 18" Randy Tuten-designed poster for "DotG #1" which was held on 5/28/1978 and featured the Beach Boys, Linda Ronstadt, Elvin Bishop, Dolly Parton and Norton Buffalo; printed on thin flat stock, this one is in B/B+ to B+ condition- ultra light handling, a few scattered small bends/dings and a small 1/2" tear at the top center. The second poster is an extra large (23 x 35") boxing style thin flat stock poster for the 7/4/1981 "DotG #1", which featured Heart, Blue Oyster Cult, Pat Travers, Loverboy, 415 and "special guest" Ozzy Osbourne. This one is in very good (B/B+) condition- some handling/creasing (not too bad/extreme), surface wear (little smudges, etc..), otherwise fine. Printed by Colby Poster of Los Angeles, this is a real unusual early '80's BGP item.