How about a guy game marathon? Choose some of fangames(you could include original I wanna be the guy), and race all of them in order.(after finishing one, start another immediately)
Here's an example list I suggest for the marathon.
1. I wanna be the Guy (Glitchless)
2. I wanna get the Yellow Star
3. I wanna conquer the blow game
4. I wanna conquer the blow game 2
5. I wanna conquer the blow game 3
6. I wanna be the GReeeeN
7. I wanna get cultured
8. Not another needle game(Bad end)
9. I wanna be the boshy(Average)
10. I wanna kill the kamilia 2
The list above is just my suggestion. If you're going with marathon, you don't have to use that exact list.
I think this could be good for nice, long stream, if that's what you want.