Mid-March Day is a term used to refer to the 15th day of March, which is also known as the Ides of March. This day has a special significance in the Roman calendar and is often associated with the assassination of Julius Caesar in 44 BC. It is also a day of celebration for many cultures around the world. In some countries, it is a day of remembrance for those who have passed away, while in others it is a day of celebration for the coming of spring.