Only Once Every 4 Years
Today would be special even if it weren't Interplanetary Multiply Everything by 4 Day because it's February 29, that day that only shows up every fourth year - almost.
It's only a leap year at the turn of a century when that year is divisible by 400. Seriously.
So today to celebrate all this four-ness, just go around multiplying everything by 4 whenever it makes sense to do so.
You want a piece of toast for breakfast? Have 4 of them.
Buying a new car today? Get 4 of them.
Watching an episode of Game of Thrones today? Watch 4 of them. You were already planning on watching 3? Watch 12 of them.
I think you get the idea.
There are events and circumstances which you shouldn't celebrate this way.
Getting married today?
Robbing a bank today?
Having an operation today?
I think you get the idea.