5 games max per team. This is a rule from the RFU to limit playing time from a player welfare point of view. U7 players can play a maximum of 50 minutes per day.
4-a-side. Max. squad sizes = 6. Festival match duration: 5 minutes per half. Pitch size: 12m x 20m. See: https://ealingrugby.co.uk/wp-content/uploads/2017/11/Ealing-Minis-Festival-2017-Information-Pack-18-19-Nov17.pdf
Under 7