I believe your dB levels are a little underrated.
If you do not have enough time to thoroughly test the environments ahead of time and you're just going to use what you have available to record the events, I would recommend installing an app on your phone, if you have a good quality phone, to give you a more precise reading of the dB levels. Just in case you have mic failure during this recording. So that you have a more accurate reading of the dBs.
Just a few recorded events in the past to better evaluate your circumstance.
- Rock concerts dB levels are 120 - 130dB
- The bursting charge in the fireworks have and average rating of 145 - 150dB
- The Space Shuttle from a half mile away has been recorded at 165 - 170 dB
- A Nuclear Bomb at 250 ft away has been recorded at 210dB whether the dB made any difference at that distance. It would probably been minute at that moment.
Here is one of the links that I pulled to get an average:
'Top 10 Loudest Noises'
But if you're wondering what dB levels that are fatally Lethal to humans and life, it is considered to be around 185 - 200 dBs and this link should shed some light on this:
'Can a Loud Enough Sound Kill You?'
But if you should find a suitable solution for recording your events I would like to know what you came up with cause every time I would record the fireworks I made the videos worked quit well until the sound failed to give the experience of being there at that time. Or the sound would completely go dead at that moment of the burst.