Wabash Valley Road Runner club celebrates Pi Day! Sunday was Pi day! Not the sweet treat but, as in the mathematical constant for the ratio between the circumference of a circle and its diameter. Posted: Mar 14, 2021 9:22 PM Updated: Mar 15, 2021 10:19 AM Posted By: Staff Report TERRE HAUTE, Ind. (WTHI) - Today is Pi day! Not the sweet treat but, as in the mathematical constant for the ratio between the circumference of a circle and its diameter. To celebrate Grand Traverse Pie Company teamed up with the Wabash Valley Road Runner club to hold a fun run for people of all walks of life to enjoy!