In 8U and 6U games the primary responsibility of the referee is to manage the time and help kids stay focused on the game.
All 8U games are expected to be officiated by one AYSO-certified referee, typically a parent, an older sibling, or a relative of a player. Anyone 10yo or older qualifies. The referee is optional in 6U games.
Referees need to register as volunteers every year. Most certifications only need to be taken once, but a few may need bi-annual or yearly reviews.