What is it? WHAT IS IT? It is St. Patrick's Day for Brits. To celebrate, we (meaning, us Brits) dress up in red and white and then proceed with our usual daily routine. Until, of course, quitting time. Then, we go out to the local pubs and totally debauch ourselves mid-week, do something completely embarassing and drag ourselves into work the next day looking like death warmed over and apologizing profusely for all naughty behavior committed the previous night.
The two year old version is actually quite similar but involving less alcohol and more sugar. I celebrated by dressing in red and white (my mom snuck in a little blue just to remain patriotic to my American half) and going to nursery school as usual. 
In the afternoon, the nursery had a blow out party in the garden during which I stuffed my face with way too many cupcakes, sucked down oodles of juice, snuck a few too many candies and ran around bonkers with this lovely St. George's Day crown that I made.
When it was time to go, I went boneless and was reduced to a sobbing heap that my mom had to literally carry out the door. As expected, I passed out once I got home. However, for the record, I did NOT apologize for my naughty behavior on the previous day. It is my personal view that a two year old should NEVER apologize for being a two year old and besides, it feels good to be a little bad once in a while....
