Tips

During the opening session at P.C.M.A.'s Convening Leaders conference in Austin, actor Matthew McConaughey spoke briefly about his hometown.

N.B.A. sponsor American Express gave fans a chance to experience its digital video Pivot activity at the N.B.A. All-Star Game in February 2015. Displayed on a 103-inch screen, the experience immersed fans in the movements of some of the league’s star players.

More fund-raising organizers, like those behind Amfar’s São Paulo gala, are using social media to promote their efforts and engage guests.