Much like May 4th being May the 4th be with you and July 11th being 7-11 day, March 10 is Mario day. If you abbreviate March as Mar and bring the 10 closer, you get Mar10 which looks like Mario. As of when this post is being written there isn’t anything special that Nintendo is doing, but I guess it’s never a bad time to reminisce about your time with Mario.
When I started playing video games I was all about Nintendo and my room showed it. My sheets, my entertainment center, my toy chest and even the clothes I wore out and to bed were covered with Mario. I used to play Super Mario Bros. for hours, because I always died in the later levels. I eventually beat it and felt so accomplished, but that all went away when I beat Super Mario Land for the Gameboy. I remember I was at my grandparents house in the the living room and I was on a roll. I wasn’t missing any jumps and on the air levels I was killing everything without getting touched. I didn’t even realize how far I had gone into the game and I had no way of knowing how many levels there were, so when I beat a boss and the game showed an ending I was beside myself. I hadn’t completed most games and for me this was a huge accomplishment, so of course the first thing I did was call my friends who lived in the area and told them to come over to see my screen. It may seem dumb now, but as a little kid having the feeling that you did what none of your other friends could made you king for the day.