Yes, baring issues, fireworks are presented nightly from Memorial Day weekend (the 24-hour day is the kickoff to the summer season) through Labor Day (usually). Now, as mom2rtk mentioned, they can be cancelled due to weather conditions (usually wind), but that tends to more common during the fall and winter than the summer. The show can be cancelled or modified depending on what is happening. Sometimes they will cancel the show before it starts, sometimes it will stop after it's started and sometimes some elements might be missing. The general advice is to try and see the fireworks as early in your trip as possible, so that if they are cancelled you still have other nights to try and see them.