Green Day!

so I bused it back home today for tomorrow morning we set off for the great city of London! reason being i bought these for my sister and i (although my parents gave me the money) and they are playing at wembley!! we've both been fans of them for quite a while - i think i started listening to them when i was about 13 - so i feel i owe it to my teenage self to see the band!
so looking forward to going to london as well - really want to visit all the museums and touristy spots as i've only been once before on a school trip. is it possible to do everything in 3 days?!