This is an annual tradition. See the fireworks at Boldt Castle from other years: 2026, 2025, 2024, 2023, 2022, 2018, and 2017.
Here is a video of the fireworks. One particularly interesting part of this video is when the big ship goes by around the 10:50 mark. Apologies for the tight framing in the video. I forgot the wider lens for my video camera but figured I would post this just in case anyone wants to see this.