Give or Take
Today is 200th Day of the Year Awareness Day, even if it isn't the 200th day of the year. Some years it will be and some it won't, depending on whether or not it's a leap year.
So be aware.
To actually commemorate the day, it seems you're supposed to do something related to the number 200. Well, duh!
I guess you could do the same thing 200 times, but that would probably get tiresome really fast. And depending on the activity, you might not even be able to finish all 200 attempts in one day - driving to and from Ottawa, for example.
So finding something else that involves the number 200 is more likely - watching a rerun of a 200-mile race on the NASCAR channel comes to mind.
Counting 200 objects should qualify. Finding 200 of the same object would be the real challenge there. Maybe if you counted 200 of the same type of object it would be easier. Board games come to mind here.
Maybe you'll invent a better way to celebrate. If you do, let us know.