“Extra” host Mario Lopez (above) was the celebrity guest at the Run & Ride at CambridgeSide Galleria on Sunday. He joined local kids who ran and rode their bikes around the shopping center in a duathlon (which resembles a triathlon minus the swimming leg). Lopez — who with Miss Cambridge Carrie Sunde handed out medals at the end of the event — also hosted Saturday festivities at Boston nightclub Venu and dined at Grill 23 with local club king Jeff London over the weekend.
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