Haven't seen one. But I just started a little tournament, just to see if anyone would bite haha. But I really wish this forum had like monthly get-togethers.
In the "Flip This" section there is a ongoing bi-weekly sample battle that is very active. It seems like its the only real battle anybody is focused on in FP. I wish they would put a sticky about it in the battle section.
I used to do the arena battles like some years ago. Got to busy to keep them going. And it used to be a thing on this site to have a battle league every year. Used to be live back in the days!!