In Georgian times most entertainments took place at home. Society Balls were held in the large private ballrooms of the upper classes. But Assembly rooms were one of the few public places where it was socially acceptable for both sexes to meet, dance and enjoy themselves. In London, Almack’s was the most exclusive Assembly room during the Regency Period (1811 -1820).
One of the ways that exclusivity was guaranteed was that you needed a voucher to attend Almack’s. And you obtained a voucher from one of the patronesses of the establishment, who ensured only the upper class were allowed to enter. One of the patronesses was Emily, Countess Cowper, who was presented and married in previous posts.