I'd love to go to Grasspop. Aren't Maiden headlining? I heard Judas Priest, BFMV, A7X, Apocalyptica and Iced Earth are going too. If so, that would be amazing!
As for Leeds, I'm sure I'd think 99% of it was shite but if the other 1% was Metallica then I'd be there like a flash! I'll never forget the Wembley gig last july, I can't wait to see them again.
I think I might go and see Down in Manchester too if there are still tix avaliable.