Referees failing to show up at designated games

You are a parent/ and or volunteer of a pop Warner football team and have been asked by the team sponsor/manager to assist with the management of the following risk events that could occur during the season:
Referees failing to show up at designated games.
Fighting between teams.
Pivotal error committed by a referee that determines the outcome of a game.
Abusive behavior along the sidelines by parents.
Inadequate parking.
Not enough teams sign up for different age brackets.
Serious injury.
How would you recommend that they respond (risk response i.e., avoid, accept, transfer, etc.…) to these risks and why? Be sure to list each event and a risk response along with a contingency for each event.