If you are going for landscape of the event during dusk or fireworks, like these shots:
These are essential
-- sufficient camera batteries
-- sufficient memory card storage space
-- suitable compact tripod & ball head as viewing gallery is narrow
-- spirit level gauge to check on horizontal tilts
-- wired remote shutter trigger
Starting point of exposure setting is as low ISO setting as possible and smallest suitable aperture setting of your lens. Adjust shutter speed to get desired exposure.
The rest of the information have covered by others.