A day to plan and consider the future direction. What do you want to do, what position do you want to do, and set specific goals. Listen to lectures and speeches in this field whenever you have the opportunity, especially the experience of experts interested in the development direction is worthy of reference. It is also beneficial for people who want to cram a certain subject to listen to the explanation of cram school.
Don't take it seriously! For entertainment only! Can't believe superstition!