You know the "WHO CARES" and whatever signs at basketball games? We need three signs: START, WEARING, and PURPLE. Big rough ridin' signs. Double sided so they can be read from both sides (don't eff it up by putting START on both sides, you'll have a START/PURPLE sign, a WEARING/WEARING sign, and a PURPLE/START sign). That way it reads from both sides.
THEN! Several times a game, timeouts maybe, we form three concentric circles. The inner circle is holding the signs. The middle circle is singing loud as eff, and clapping their hands. These people give a good example to follow. The outer circle encourages the people around them to take part.
Guys, WE CAN DO THIS!