The 2008 Symposium on Computer Animation will be in Dublin, Ireland from July 7-9, with paper deadline April 18.
Eurographics 2008 is in Crete, Greece April 14-18.
And of course SIGGRAPH 2008 is once again in Los Angeles, August 11-15, with paper deadline this coming Wednesday, January 23.
No word on the Workshop on Natural Phenomena yet.