I was wondering if this day happens every year?
It is every year. Akshaya Tritiya is the third day after the new moon. Fifth day after the new moon is when Adi Shankaracharya was born.
That is why my parents also kept my name Shankar, because I was born on the same day.
The main knowledge of Adi Shankara is only one thing, everything is perishable. Thoughts come and go, feelings come and go. One day everything disappears. But you are the light that stays forever.