Uh oh, the 40th anniversary of Woodstock is about a month and a half away. Did you remember? If not, it’s probably due to the distinct lack of buzz, seeing as there is no official concert scheduled, although boosters keep adding “as yet” in hopes that original co-producer Michael Lang will manage to put together a show in New York’s Prospect Park. A handful of mostly lame events are planned for different parts of the country, and a tour called Heroes of Woodstock — featuring Mountain, Jeffe