Meeting includes speaking, not just viewing or hand-slapping as they pass a fence or walk by. As a sports-car racing fan, I've met and gotten autographs from Mario Andretti, Derek Bell, Dan Gurney, Fangio II (while he drove Toyotas for Gurney), Brian Redman (who is great fun!) among others. I met Bob Varsha (U.S. Speed TV commentator for you foreigners) at Road Atlanta during the 1993 Trans-Am weekend, and at Daytona, spoke briefly with David Hobbs and Dave Despain as they were setting up in the grandstands during a 24-hour race (no time for autographs.)
Musically, I've met Kenny Rogers, James Taylor, and (uh-oh) Barry Manilow. Had a backstage snack and conversation with a group of people that included Barbara Mandrell and her concert performers. Barbara, if I may take the liberty of using her first name, is not much taller than DeVito.