While not appearing in last night's episode, Bradley Whitford attended the Cure Autism Now Gala with his wife.
WireImage has photos, so does GettyImages here, here and here.
If you are having trouble viewing the Getty picture, delete the "http://" from the address bar, and then press enter.
John Spencer and Kristin Chenoweth attended as well.
NiCole Robinson, who plays Margaret, was there as well.