Derrick Cartwright vividly recalls seeing photographs of contemporary artists protesting the Vietnam War in front of Picasso's great antiwar painting while he was an undergraduate in Berkeley. Where are those politics now? What is the enduring influence of the great 20th-century antiwar painting? Joining SAM's director in a discussion of Guernica's social and political implications, present and past, are Manuel Borja-Villel of the Reina Sofia in Madrid (where Guernica resides) and former Spanish cultural secretary Miguel Angel Cortés. The painting doesn't travel, but its emissaries can. (Seattle Art Museum, 1300 First Ave, 344-5275, 7 pm, free)