Meghan Arminas makes a poster while camping at a celebration of Woodstock on a piece of the original Yasgur farm in Bethel, N.Y., . Tie-dyed pilgrims and white-haired Woodstock festival veterans converged at the generation-defining site to celebrate its 50th anniversary, while Arlo Guthrie came back to sing ? what else? ? "The Times They Are a-Changin'." Along with other local celebrations, Bethel Woods Center for the Arts is hosting a series of events at the bucolic 1969 concert site, 80 miles (130 kilometers) northwest of New York City