Almost all major cities in the US celebrate the 4th with some sort of fireworks display. Most are low dollar shows, nothing too major. Many cities will only shoot smaller shells because of budget and distance restrictions. 3-4" and we're not talking about a Caballer show with 3-4", just plain old shells one or two at a time and some cakes here & there. There are fireworks everywhere, but I haven't seen any really killer displays for the 4th.
PGI demo shows are usually the best displays I see all year.