Pi day

Pi Day is an annual celebration commemorating the mathematical constant π (pi). For an in-class exercise: Think of companies/brands that can use Pi Day in a fun way (excluding pie companies and bakeries), including in headlines, events, fun images, etc. Also, find at least 1 actual brands/company that is using Pi Day in their promotions. Provide the examples. Here are some past examples: http://www.adweek.com/adfreak/just-about-every-brand-wants-slice-pi-day-156307