World Autoimmune Arthritis Day is May 20, 2012
Its an online virtual event - you can sign up ahead of time if you want to participate. It is free and starts on May 19.
I don't know for sure when the Lupus specific parts of the online convention will be yet because May is still a ways away. I know many of us here have other Autoimmune Arthritis diseases in addition to Lupus like Sjogren's, RA, UCTD, MCTD etc etc and the wehavelupus.com family may want to join in the convention.