Updated: Mar 15, 2021 10:01 AM Posted By: Staff Report But not to be confused with National Pie day that's in January. This one celebrates the math equation 3.14. Over at Grand Traverse Pie Company, they are giving out a free slice of pie with any purchase. The general manager reflected on how the world turned upside down for their business this time last year. "And then we found out the following Friday from Pi Day that effective on March 23rd of last year that we were no longer going to be able to operate our dining rooms so it's been a year ago today almost that we've been into this," says general manager Steve Huddleston.