Park ranger Nick Sacco will give a presentation about Ulysses S. Grant and slavery at the Ulysses S. Grant National Historic Site, 7400 Grant Road. Sacco will share his research about this topic. Presentations at 10 a.m. and 1 p.m. (1 p.m. has a wait list) Free reservation required. Call (314) 842-1867, extension 230.