Not sure I understand your question. You can definitely go down to Geyser Point and watch the fireworks with the music piped in (while sipping a beverage). Or, you could take the boat to MK and watch the fireworks there.
With a 5:00 ADR you will have plenty of time to get to the MK and the fireworks by boat. It is a 10-minute boat ride and boats leave every 20 minutes.