How could a web site with "Circle" in its name not celebrate Pi Day?!
In US date format (month, then day) today is 3.14, the first three significant digits of Pi. Better yet, this is the only year in a century for which in MM.DDYY format the date is 3.1415, and at 9:26:53 am (and again 12 hours later) it will be 3.14 15 9:26:53...
Make sure to have some Pi(e) to celebrate the occasion.