I wonder if even the larger stamp shows will survive unless they are held in certain cities. I attended EuroPhilEx 2015 held in London, I was planning on attending the EuroPhilEx held at Birmingham's NEC. Last year, I spent a long weekend in Shrewsbury. I took a late evening flight to Birmingham and spent the night at a hotel near the NEC. So, I knew it was easy to get there.
Even at the end of 2024, the hotels had raised their prices considerably. They were more than twice as high as a few months earlier. They only went up from there.
In the end, the high prices and the bad timing kept me from hopping on a flight. Also, I would have had to return on an early flight back home on Saturday to be in time to support my favourite hockey team for the final game of the season.
From the few posts I read about the stamp show, I get the impression it was somewhat disappointing. Royal Mail issued a souvenir sheet on the first day of the show. In the past, such souvenirs from stamp exhibitions held in London soon sold out. I found they were available from Tallents House.
I had to postpone ordering them due to a holiday and PostNL's tendency to return items sent with track and trace as soon as possible. Items are returned within a week.
Back from my holidays, I was surprised they, still, were available from Tallents House as late as last week. There are not even enough interested collectors to sell out 7,500 numbered sheets of the Dame Vera Lynn miniature sheet with an exhibition overprint, two months after the exhibition.
The exhibition souvenir with overprint at the top:

The original issue with the barcode strip:

I cannot say Royal Mail went out of its way to create an interesting souvenir of the exhibition.