DailyPlanetCleveland City Council has officially declared April 18 Superman Day, marking the 1938 debut of "Action Comics" no. 1 and honoring the city's legacy as the birthplace of the Man of Steel. The date will be celebrated annually, beginning with a Siegel and Shuster Society luncheon this month.
https://dailyplanetdc.com/2026/04/07/cleveland-superman-day/
Cleveland declares April 18 Superman Day, honoring the Man of Steel’s birthplace - Daily Planet
Cleveland City Council has officially declared April 18 as annual Superman Day, recognizing the city as the birthplace of the iconic hero and honoring the Siegel and Shuster Society's decades of advocacy.