Ken Day is celebrated annually on March 13 to honor Ken Carson, the official boyfriend of Barbie. This day acknowledges Ken's enduring support for Barbie, who has evolved from a housewife to a successful businesswoman. The celebration reflects on Ken's character, highlighting his love for Barbie, his inventive nature, and his interactions with her sisters. Ken Day commemorates the debut of Ken Carson by Mattel, marking his significance in the Barbie universe. Despite facing criticism regarding his masculinity and appearance, Ken's relationship with Barbie has endured various challenges, including a brief separation. The day serves as a tribute to their long-standing romance and Ken's efforts to win Barbie back, culminating in their continued partnership.