Ok so I'm thinking of going sunday, monday and thuesday, I assume it isn't necesary to get tickets in advance so I could just buy the tickets when I get there. Or is it recommended to get the tickets in advance
You won't need to get tickets in advance.
Once, on a wednesday arriving late in the morning, I wasn't able to buy tickets to the main stadium. It didn't matter much, because ground passes are more fun anyway.
Unfortunately, I won't be able to attend this year.