Saturday night post-Shabbat celebration, in honor of King David.

festive meal held on Saturday evening to farewell the departing Sabbath Queen

Festive meal held after the close of Shabbos to escort the departing Shabbat Queen.

Melaveh Malkah (Hebrew: מלווה מלכּה, lit. "Escorting the Queen") is the name of a meal that, as per halakha, is customarily held by Jews after Shabbat (i.e. Saturday evening).