custom games?

Is there any custom games lobbies or anything? Would love to play some good fun games with a bunch of people.

Search halolfg, there are a few sites and a subreddit for finding games of halo, and many people host custom lobbies in them

FROZEN SHADOWS GAME NIGHT
~ Tonite at 7:00 pm Easter 6:00pm Central The Frozen Shadows we be launching a training event that we start out with some BTB working its way into custom games. If you would like to join us please feel free to message me on xbox.