This has been discussed before. It's no good putting on a single rapper team in the middle of a sports stadium. Rapper needs to be seen up close. A massed morris would do, a massed sword dance wouldn't. There's still be lots to considere as to what dances are performed (not to mention which style of morris!), how to train up the numbers needed to fill the stadium, how everyone is going to hear the music at the same time etc. The morris would work best outside the stadium along with the buskers and other stret entertainers.