A bike motor factory in Southern China sent me this message today, "Have a great Ester Monday holiday."
According to Google AI: "In chemistry, an ester is a compound formed by the reaction of an acid and an alcohol, resulting in a molecule with the characteristic structure RCOOR'. Esters often have a pleasant smell and are found in natural oils, fragrances, and various synthetic materials. The word "ester" also refers to a feminine given name, potentially related to a Babylonian goddess Ishtar or the Persian word for star.
They must think that all our holidays are on Mondays. Just like Cinco de Mayo, the Fourth of July, and 420!