Photo: Provided. April 29, 2021 White Castle has pegged its latest promotion to National Burger Month, which starts Saturday, May 1 and this year falls within the brand's celebration of its centennial. As the official sponsor of National Burger Month the brand is offering a month of specials, including a sweepstakes that will net one customer a $100,000 grand prize, a news release said. "White Castle is the official sponsor of National Hamburger Month, having created the month-long event in 1991 to pay homage to the Original Slider we created and the industry we pioneered," President and CEO Lisa Ingram said in the release. "So it's always a special occasion for us, but especially this year as we celebrate our hundredth birthday. We look forward to having some fun this month with our Craver fans."