A fête Galante is a depiction of a party where lavishly dressed couples in romantic poses enjoy each others' company in an outdoor garden setting.
"Fête galante" is really an art historical term that refers to a genre of painting.
|Antoine Watteau, Embarkation for Cythera, 1717|
A few 19th century artists such as Ernest Meissonier (1815-1891) took up the theme in a more realistic way.-----
Wikipedia on Fête Galante
Images of Fête Galante on DuckDuckGo