There aren't many holidays made just for Math Teachers...but PI Day (March 14th) is one of them! Upon reading Sir Cumference and the Dragon of PI by Cindy Neushwander, give groups of students various round food items and a ruler to review radius, circumference, area, and diameter. Then, have them create their own version of a PI Day song based on a favorite song. Here is mine to the tune of 867-5309/Jenny by Tommy Tutone:
Jenny don't change that number
I need to make it mine
Jenny, I've got the number
Whatever you do.... celebrate PI Day in a fun way!