Luna is already sitting at the far end of the table. Prince Blueblood sits in the chair to the right of Celestia’s end of the table, as the current master of the royal household. For all the stallion disparagement you hear, you’ve noticed they’re trusted implicitly with any and all domestic operations. As Celestia sits at her end of the table, you sit in the chair to her left. Other seats are occupied by unicorn representatives of the various dukes that managed Equestria’s regions.