All you need for summer perfection is one big park and a whole load of bands (aka, a festival). Think alt-rock, underground dance, and weirdo pop to the tune of Metronomy, Money, Erol Alkan, Ghostpoet, Simian Mobile Disco, Warpaint, and Thurston Moore, among so many others. General admission, no re-entry. Over 18s only. Event runs 11:30am-11pm.