Alexander Rossi, the Nevada City teen who won the 2008 Formula BMW Americas championship, will speak about doing one’s best at a showing of “Down and Derby,” a movie about the Boy Scouts of America’s Pinewood Derby.

The event starts at 9:30 a.m. Saturday at the Del Oro Theatre, 165 Mill St., Grass Valley. It’s hosted by Cub Scouts Pack 23; all scouts in uniform get in free, others get in for $1.