Whatever cause you hold near and dear, Ben Affleck wants you to do something about it.

The Argo star, 39, will honor a dedicated youth activist Sunday evening with a $100,000 prize at the Do Something Awards in Santa Monica, Calif. (The show will air August 21 at 9 pm on VH1.)

PHOTOS: Stars' good deeds

Affleck himself is a celeb Do Something nominee, along with Kristen Bell, Justin Bieber, Taylor Swift, Miley Cyrus, Nicole Richie, Neil Patrick Harris, Channing Tatum, Emma Stone and more.

PHOTOS: Everyday celeb heroes

The issue most important to the father of three? Fostering development opportunities for residents of the war-torn Eastern Congo; in 2009, Affleck founded the Eastern Congo Initiative to help do just that.

This article originally appeared on Usmagazine.com: Ben Affleck Presenting $100,000 Grand Prize at Do Something Awards!