When the state first introduced the concept of a tax-free weekend the first week of August it was pitched as a way for cash-strapped families to save money on back-to-school supplies. Then people started asking questions like, “What does a wedding gown have to do with going back to school?” So the N.C. Department of Revenue eventually dropped that conceit. Now, there are all sorts of things that qualify for tax-free weekend, including many that help with an active lifestyle.