The host must be delighted by the turnout!
I won’t be able to forget this when describing a crowded ball or reception! The clothing is particularly interesting. Compare the lady on the right in white (a demure debutante?) and the one on the left with the train (rather less respectable, I think). The description in Wikimedia: “Shows a crowded royal “drawing room” reception (in a London palace). The woman at the left (whose train is being stepped on) is wearing the old-fashioned hooped “court dress” (abolished 1820), while the man in the door is wearing formal breeches (many of the other men are wearing military uniforms). The moustache of the man on the right had connotations of foreign (Continental) and/or military dandyism at the time.”