There isn't, but that'd be really cool.
We have the 'events' list in game, but having something more complete and on a longer time scale would be really helpful. I think the next events coming up are TimmyB 2 (for whatever reason) and Hephaestus 2 (for all the awesome reasons). Burning Colosseum should be in July, but not knowing when these other two events are starting or ending makes planning for it quite difficult. Then there's the GoIO League that should be starting up again at some point? And probably a few things I'm not aware of yet.