November 13th, 2023
Widely observed in US, usually on the first Saturday in November. Tradition established in "Li'l Abner" comic strip in 1930s by cartoonist Al Capp. A popular occasion when women and girls are encouraged to take the initiative in inviting the man or boy of their choice for a date. A similar tradition is associated with Dec 29 in leap years.
Source: www.almanac.com/extra/when-sadie-hawkins-day