This can't be more Oxford :)
The big rowing competition (Summer Eights) between colleges, people picnicking everywhere by the river drinking Pimms (what?) and cheering for their rowing team. Didn't bring my camera so I stole this pic from the Exeter college team, hope they don't mind since I will be staying there for two weeks in June ;)
I have to recommend an Oxford band that is really good, they are called Stornoway, very very good and funny :) Check out the Good fish guide !!