This card was a challenge, but thanks to Google Image Search I was able to track down who was presenting Tony with a glass plaque, and why...
Card Number 745: Upper Deck, 1998; #15
Cards 9-18 in Upper Deck's flagship set were a subset called 'Ken Griffey's Hot List'.
12 Jun. 1997: Anaheim Angels Eddie Murray gives San Diego Padres Tony Gwynn a crystal plaque commemorating the Padres playing there [sic] first interleague game against the Angels at Edison Field of Anaheim. (Photo by John Cordes/Icon SMI/Corbis/Icon Sportswire via Getty Images)