Decide when and where to hold the challenge. The marbles can roll long distances. Try to find a place with a long, smooth, unobstructed, flat surface. If the surface slants, you'll need to figure out how to make it as flat as possible.
 

Get permission from the administration.
 

Have a camera and film ready to take pictures.
 

Incorporate the day into the school's math or science afternoon/night.
 

Invite parents and school personnel.
 

Ask a reporter from your local newspaper to be present on Marble Roll Day!