 Because what you drop, a cow could be eating in three weeks' time. And it's not just music. There's art, magic, acrobats, political activism. Last year, this festival raised more than $2 million for three big charities, Greenpeace, WaterAid and Oxfam. That's NPR's Lauren Frayer at the Glastonbury Music Festival in southwest England. Lauren, enjoy this hardship assignment.