The first poster is by Clifford Charles Seeley for Berkeley Bonaparte, 1967. Seeley did several rock posters in the same style, including Jefferson Airplane and Hendrix. The identification of Haight Ashbury with Middle Earth was popular among residents at the time.
The second poster (below) displays Barbara Remington art from the first authorized paperback edition of The Fellowship of the Ring. There’s also a 1968 jigsaw puzzle featuring all of the images from the trilogy side by side.
The “Come to Middle Earth” and “Frodo Lives!” memes were employed (or co-opted, depending on your point of view) during the extensive marketing campaign for Bakshi’s 1978 animated feature.