January opens the calendar year with 132 national days, fun holidays, and observances on Calendar.cx. New Year's Day on January 1 kicks things off worldwide, followed by Martin Luther King Jr. Day on the third Monday. Quirky celebrations include National Corn Chip Day (Jan 29), International Sweatpants Day (Jan 21), and National Argyle Day (Jan 8). January is also home to Vietnam Peace Day (Jan 27) and International Domain Day (Jan 1). Whether you're looking for awareness days, fun food holidays, or historical commemorations, January's full calendar has something for every day of the month.