Genetics Society of America - Official Society publication is "Genetics". They sponsor a number of model organism-specific meetings, including the biannual International C. elegans meeting (next meeting: June 27 - July 1, 2007, UCLA).
Society for Developmental Biology - Official Society publication is "Developmental Biology". Meetings are held annually; next meeting will be June 16 - 20, 2007 in Cancún, Mexico. The Northwest Regional meeting is held every March at Friday Harbor Laboratories on San Juan Island.