Several states have “sales tax holidays” where for a day or a few days specified during the year, there is no sales tax on specified items. For example, it might be on children’s clothes or school supplies close to the time when school begins. Some states have them for guns and emergency preparedness items. The Federation of Tax Administrators maintains a list of these holidays in the states.
September 16, 2015, Colorado had a holiday on marijuana – but just the special 10% and 15% taxes (there are a lot of taxes on marijuana in Colorado). The reason is complicated and ties to the fact that when recreational sales became legal in Colorado and new taxes added, they raised more than allowed. HB15-1367 explains some of this (in 33 pages!). Read more