• What it is: It's a day to recognize and celebrate the contributions of administrative professionals, secretaries, and other office support staff. • When it is: The last Wednesday of the last full week of April. • Why it's important: It's a chance to show appreciation for the hard work and dedication of these professionals who are vital to the smooth functioning of offices. • Other names: It's also known as Administrative Assistant Day or Secretary's Day. • History: The holiday originated from the National Secretaries Association (now the International Association of Administrative Professionals).