Woodstock is colloquially used to refer to the Woodstock Music and Art Festival, a famous rock music concert.
It is the name of a song and a film about the festival as well.
Woodstock is also a fictional character in Charles Schulz's comic strip Peanuts. He is a small yellow bird who has been a constant companion to Snoopy since the 1960s, though Schulz didn't give him a name until 1970.