Prep for Magnus Carlsen

Some of you might know that I have Muscular Dystrophy, so I qualified for a wish from the wonderful organization "Make a Wish." My wish was to play chess with Magnus Carlsen, and it just got approved. Now I don't know the details yet, but it will be in Norway this summer, and I am really hoping to play him. But if I do get to play him, I want to make the most out of the game, even though I know I am going to lose. So how do you prepare against the World Champion? He plays a ton of openings, and is really good at positional play and endgames. Any advice helps. Thanks.