As well as this seemed to be organized, it ended up failing almost completely when it was supposed to happen. Instead of many different parties, we were able to fit all of the members that were online into a single party for Matchmaking and such.
I'd recommend changing the title from "Nights" to something else, since noon is not many people's ideas of a night. Also, having the people in each party more connected than a list will help, as well.
Finally, it would be better if there was one party for Matchmaking, one for custom games, and one for Forge, so that there isn't a constant swaying among all three. That way, people can choose what they want before they have to choose along with or against 7-15 other people.
It was a good start, and it was fun while it lasted, but if today is anything to go on, there isn't much of a future for this idea.