In the Boston area, a person named Joe Quigley has run The Math Club, a private after-school math coaching program for over 20 years. I think it's safe to say that almost every very strong math kid in the Boston area attended his programs in elementary school. He was very good at prepping kids for International Olympiad for Elementary and Middle School Students and the AMC-8.
One of the highlights was Pi Day. He would buy hundreds of 4 inch pies and have a pi recitation contest. For every fifty digits of pi you remembered, you would get one pie of your choice. My son memorized 250 digits and was eating pies for a week. Funny enough, he still remembers all those digits more than 10 years later.
