the ushers in a wedding?? They accompany the bridesmaids in the wedding party. But I think the bridal courts are kinda going out of fashion.
Mexicans call it exactly that "chambelan" usually for a 15th birthday. The "quincianera", the birthday girl has 4 or 6 guys accompany her and they all do dances for the guests.
We also have "chambelanes" for quince parties. There are usually 15 chambelanes/damas. The birthday girl first dances with her dad, then she dances with her designated charberlain and then the whole groups presents their dance.