With my group I would explain how the game works, the importance of the different roles and how to create character sheets. We would play D&D so that the players could grasp an understanding of how the game works in a group of six (or less).
This event would be held at the Green Dragon Inn, Spon Street. All players will observe COVID guidelines as required by the Green Dragon. I have the support of my parents and will ensure any other players under 18 will have permission.