The Seven League is looking for teams to participate in its mk7 war tournament:

http://www.forums.mkboards.com/forums/7l-seven-league.597/

Maybe you can discuss this in your clan, or you can try to compose a team yourself.
Personally I'm not able to participate due to work and family life, but it's nice to see that they try to bring back a big tournament like the Prime League used to be.
Matches will be held in weekends.