This Activity is meant for Boy Scouts.
Decide for yourself if it is appropriate for your younger scouts or not.

Flint & steel set per patrol.
Lots of dryer lint.

Collect a lot of dryer lint and save it for this activity.
Have water ready and don't do this on a windy day.

Determine the largest patrol size present. Make that number of lint piles for each patrol. Patrols with fewer scouts will have some scouts light multiple piles.

Draw a starting line with patrols lined up behind it.
Make a row of lint piles for each patrol about 20 feet from the start.
Patrol leader is first in line and is given the flint & steel set.
On signal, scout runs to first lint pile and lights it. When judge determines it is burning adequately, the scout runs back and passes off the flint and steel to the next scout.

First patrol to light all lint piles wins.