With less than a month to go, the city of Kyle is trying to ramp up interest in its celebrations of National Pi Day — but it’s a delicate balancing act. The city that bills itself Texas’ capital of things baked in pastry shells is celebrating the imminent arrival of spring on a day that is the numerical representation of a mathematical constant, March 14.

Though the day’s schedule calls for “Pi recitations” at 3 p.m., that’s the only connection to math an...