What is a holiday on the 28th?

The 28th of February is celebrated as Rare Disease Day, a global awareness day aimed at raising awareness for rare diseases and improving access to treatment and medical representation for individuals with rare diseases. The date is chosen because it is the last day of February, which occurs only once every four years during leap years, emphasizing the rarity of these conditions. Additionally, some countries may have their own local holidays or observances on this date.