Riven & heart x3 (because I like running the heart). 590+, 5+ clears preferred. I don't mind helping people who are honest with me. Staying silent trying to fly under the radar won't get you an invite.
The game creator, crazychunkymonky, should send out invites 5-10 minutes before start time. If you don't receive invites, the creator may have left so start inviting each other through xbox/psn/pc on your own.