Also called Sadie, Sadies. a party, dance, or other social event, especially one held annually among high school or college students, to which each girl escorts the boy of her choice, or invites him to escort her.
a day (Sadie Hawkins Day) or night, often in November, when such an event or events are held.
Origin of Sadie Hawkins
1939, Americanism; after the race held on Sadie Hawkins Day (in the cartoon strip Li'l Abner by Al Capp), in which single women pursued bachelors