 The cows are just missing at the moment. And that's why you have to respect the land even more. You know, no glass and no non-biodegradable glitter. 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.