Our local literacy council holds a knowledge bowl fundraiser each year. Teams from different organizations or businesses pay to enter and compete. This year DH offered to sponsor DS 13 & buddies if they wanted to be a team (there's a high school division) and explained that it's for a good cause.
The boys were a little reluctant, but agreed to do it. The event was last night, and they loved it (and won every round!). Great way to spend a couple hrs on Friday evening. Plus they saw a healthy population of philanthropically-minded citizens who volunteered & participated in the fundraiser. One boy said, "I wanna do this every year!" Isn't that cool. (Remember, my new campaign to infiltrate their subconscious about how "it's cool to be smart...it's cool to be smart...")