Some stores in the UK were trialling a quiet hour last year.

It'd be worth asking.

https://corporate.asda.com/article/inclusive-hour-store-list (Tuesdays 10-11am)


The Asda page particularly mentions autism and dementia but they don't exclude the rest of us.
https://corporate.asda.com/blog/2019/02/05/were-extending-our-dementia-and-autism-friendly-inclusive-hour-trial-to-more-stores

"I suffered for many years with anxiety. I used to absolutely hate going into busy stores. There are a lot of people out there who have mental health issues. There are many people who don’t talk about it.

"We have a lot of disabled customers and we want to make the shop better for them."

Simon is amazed at the reaction to his idea. He said: "I've had customers from all over the country ring me to say they think it's a great idea, as well as managers from other businesses who are planning to do the same thing. To think all of this came from a one-minute chat with a customer and a Facebook post! It’s fantastic."