TOP THAT: Top Chef Master Rick Bayless will give a demo for Green City Market at the Peggy Notebaert Nature Museum. Bayless recently opened up his third Mexican restaurant, Xoco. Try pronouncing that one. 2430 N. Canon Drive; Lincoln Park. 10:30 a.m. to 11 a.m.
GET STEAMY IN THE FIRST PERSON: “Everything Is Illuminated” author and nerd hottie Jonathan Safran Foer stops by theHarold Washington Library. Safran Foer will read and sign copies of his latest work, the non-fictional “Eating Animals.” 400 S. State St.; South Loop. 6 p.m. Free.
ROAMING COUGARS: If you hear news reports of a cougar loose in Wicker Park, don’t worry. It’s most likely not a randy older woman or the four-legged creature, but the indie-rock band Cougar. The group plays with openers 1000 Vertical feet at Subterranean. 2011 W. North Ave.; Wicker Park. 9 p.m. $10. 21 and older.
