<http://schema.org/openingHours>
"Mo 12:00-17:00, Tu 12:00-20:00, We 12:00-17:00, Th 12:00-17:00, Fr 12:00-17:00"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.wilson-center.com/calendar?view=calendar&month=August-2014>