For the occasion both women went super casual. The first lady wore cropped gray capri pants and a yellow argyle cardigan with silver and metallic pink sneakers. Dr. Biden did preppy chic in a blue and white striped shirt paired with cropped white pants and silver flats.
UPDATE: The first lady's kicks are Lanvin cap toe sneakers, as ID'd by websites TalkingShopping.com and First Lady Of Style and the NY Daily News, and range between $540 and $565 at Barneys.com. The argyle sweater is from J. Crew, of course.
See photos below.