 While many firework shows take place for July 4th, some people choose to stay home and produce their entertainment. Delaware Public Media's Joe Irizarry has more on what you can do legally. Sparklers and ground-based displays can be purchased until July 4th, and the person buying them has to be at least 18 years old. Those sparklers and ground-based items can only be used on July 4th. Come July 5th, they can't be used again with the exception of the third day of Diwali and New Year's Eve and New Year's Day.