What festival is Monday?

National IDD publicity day. According to the calendar of official website, Monday, May 15, 2023 is the National IDD Publicity Day. May 15, 2023 is the 30th "Prevention and Treatment Day of Iodine Deficiency Disorders" in China, with the theme of "Scientific iodine supplementation for 30 years, benefiting the country and the people and protecting health". Iodine is an indispensable trace element in human body: thyroid gland synthesizes thyroid hormone, which can promote human development and maintain normal metabolism.