It's been a rough few years for Chicago's Chagall fans. His beautiful America Windows has been off exhibit at the Art Institute because of construction on the museum's new wing (and won't be back till 2009). And in 2005 one of his paintings was sold to a private collector. However, we still have the Four Seasons, and there's a new biography. Its author, Jonathan Wilson, is discussing it tonight up in Evanston. Slowdown has you covered, or visit the Nextbook website to buy tickets.