1 - Be in the menu with public match, specialist, etc...
2 - Have a second controller and invit 2 friends with second controller to be 6
3 - Click to "Find match" and search and destroy
4 - If it works, you will be kick alone with countdown time at 59-58-57 seconds, etc...
5 - Quickly, press Y and put the group to 8 player
6 - Now the 2 friends and their second controller join you, but you need to be 8, so you need one more friend with second controller
7 - If you have a good connection and nat open, you will be the host, so load the gamemode from showcase
8 - Wait the game start and enjoy

Thank topic or whatever to help me out for releasing this