National Pinup Day is celebrated every April 22nd, founded by Mission Tattoo in Santa Barbara, California. This day honors the timeless allure of pinup models, capturing the essence of glamorous eras and celebrating femininity. Activities typically include hosting retro or vintage parties that embrace styles from the 1940s, dressing in vintage costumes, and researching famous pinup girls such as Marilyn Monroe and Bettie Page. Participants may also enjoy watching films from the pinup era, like "Pinup Girl" and "Some Like It Hot." The celebration reflects a nostalgic appreciation for the cultural significance of pinup models, particularly during World War II, when their images were widely popular.