U6, U7, and U8 games are officiated by parents of the teams involved. There is no formal signup.
The online scheduler is here: http://refscheduler.net/Soccer/Welcome2.asp
New referees must go to our online scheduling application, www.refscheduler.net, to create an account. We are Section 2, Area D, Region 218. Click on the button titled "New Referee Signup." Enter your personal information. After the scheduler coordinator approves your account, you will be able to self-select the games you want to officiate.
Instructions about how to use the RefScheduler can be found at this link. Email the scheduler coordinator at "refscheduler AT davisayso.org" if you need more assistance.
U9 and U10 games are officiated primarily by parents of the teams involved. The home team provides one official to be the Referee. The other team provides the assistant referees. To best assure that games are covered, we ask that all game officials for U9 and U10 games sign up for their games in RefScheduler.net.
U12 and older games should ideally be officiated by referees not associated with the teams playing. If by the day before game day, there are unfilled slots for your child's game, you are welcome to sign up for and officiate that game. To minimize complications, let both coaches know that your child is on one of the teams.
In general, do only what you're trained and comfortable doing. That would be the best for you as well as for the players.
Email the scheduler coordinator at "refscheduler AT davisayso.org"