Plans for a 40th Anniversary Woodstock concert have been cancelled by promoter Michael Lang. Lang cites the inability to obtain sponsorship as the reason.

Lang was one of four promoters to put together the legendary festival back in '69, and he wanted to hold a free concert in Brooklyn's Prospect Park to celebrate the 40th anniversary. He had to postpone those plans because he couldn't find sponsors willing to cover the $8 - $10 million price tag to stage the event. He then was shooting for the end of September during Climate Week, which is set for September 20-26th and is part of the international Seal the Deal! Campaign. This effort, according to a United Nations Website, is pushing governments scheduled to meet at COP 15, in Copenhagen this December, to agree on a sustainable climate change pact and promote an international green economy. Lang had wanted to make any Woodstock anniversary concert as green as possible.

It would have been a big boost for the issue, he said of the concert.

Lang is continuing work on other Woodstock-related projects. On August 8th, he will attend the advanced screening of "Taking Woodstock" in Woodstock, New York. The film will hit theaters nationwide on August 28th. Lang is also the executive producer of "Woodstock: Now & Then", a VH1 documentary directed by Academy Award Winner Barbara Kopple that will air August 14th on VH1 and August 17th on The History Channel.