April 9-Oct. 19: Slavery at Jefferson’s Monticello delves into the striking dichotomy between the second United States president’s unrepentant exploitation of the abhorrent institution and his championing of democracy. The exhibit traces his relationships with six families in Monticello’s slave section. National Constitution Center, 525 Arch St., Philadelphia. Call (215) 409-6600 or visit www.constitutioncenter.org.