[Plugin: All-in-One Event Calendar] Old Event Still Showing in Widget

An event which ended yesterday is still showing up in the “Upcoming Events” widget in my sidebar. It was an event happening three days in a row, and it is still showing the 28th and the 29th as upcoming events, even though it is the 30th. Any ideas as to why?

http://www.nwbellydance.com/

http://wordpress.org/extend/plugins/all-in-one-event-calendar/