[MisterBastahrd]

I'm not THAT type of neurodivergent, but for those who do have meltdowns in loud and crowded situations (this does not necessarily ever go away), they usually have something to help regulate their hearing so that they're not audibly overwhelmed.

You might try noise cancelling headphones for one. Doesn't even matter that they've got music playing in them, just that they're on to dull the cacophony of crowded spaces.