Simplify the following text for a Grade 9 native English-speaking person.
Original: Przystanek Woodstock ( Polish for `` Woodstock Bus Stop '' ; English-language materials often refer simply to the Woodstock Festival ) is an annual free rock music festival in Poland , inspired by and named for the Woodstock Festival , that has taken place since 1995 . Since the 11th festival , its organizers have called Przystanek Woodstock `` the biggest open-air festival in Europe '' .
Simplified: The festival is named for and was inspired by the Woodstock Festival ( Przystanek Woodstock is Polish for Woodstock Gathering ) .