If you have a raw ISO backup of your physical disc, converting it to WBFS is highly recommended.
This is the most frequently reported issue. You'll see the game try to load, but then you're stuck on a black screen. Mario Party 8 Wii NTSC-WBFS
The Ultimate Guide to Mario Party 8 Wii NTSC-WBFS: Setup, Emulation, and Gameplay If you have a raw ISO backup of