Woodstock’s three days of peace, love, and music
… along with myth, legend, and for some an undying idealism regarding all three
The original poster, by David Edward Byrd
And the second poster listing the expected performers list.
This website is perhaps the best single source regarding which artist went on when and what happened when they did. But it does have some myths woven in, e.g. Richie Havens did not perform for three hours, but he did play longer than intended.