Davis has a few fireworks displays during the year. Specifically:
According to the Davis Municipal Code, 13.02.010: The term '"fireworks'" as used in this chapter shall be held to mean firecrackers, rockets, torpedoes, roman candles, toy pistols, toy cannons, detonating canes, blank cartridges, sparklers, squibs and other devices designed and intended for pyrotechnic display. Furthermore, 27.03.100 specifies: Fireworks are prohibited in any city open space areas.
Since fireworks are illegal within city limits (with the exception of these permitted events) while waiting for the July 4th Fireworks you can buy glow-stick-bracelets that are good fun to wave around and the proceeds go to local organizations (ask where first).