There are some fireworks festivals that have continued for decades, so I think we need to properly pay attention to the circumstances surrounding each event.

They should all be cancelled anyway to the unbearable summer weather. Hold them in autumn.

Hanabi should always be held in safe locations.

Fireworks festivals are being canceled in an increasing number of cases across the country due to concerns about falling cinders on houses.

Some are cancelled during Covid, even after Covid some municipalities are canceling due some reason, mostly budget.

https://hanabi.walkerplus.com/list/cancelled/

Fireworks festivals are being canceled in an increasing number of cases across the country due to concerns about falling cinders on houses.

Potassium, sodium etc. that produce the colours burn at super high temperatures. So yes, this is a concern, but not a particularly new one. An abandoned hillside full of fallen dead trees could easily produce a mighty blaze too during dry weather. It sounds like this may be only one of many reasons, including rural depopulation and budget.

You can also cool, less dangerous, and yes, more dog-friendly things with lights on drones.

Fireworks festivals are being canceled in an increasing number of cases across the country due to concerns about falling cinders on houses.

Aside from people worried about possible fires (which have rarely if ever happened from these festival) there is also the excuse for cancelling the event being noise and congestion complaints from the surrounding neighborhoods.

And while I'm sure that all those complaints fro m the public do happen to a degree, these excuses for ending these events are probably being put out there as cover for the real reason: most firework events are free to attend, they cost huge sums of money from local budgets, and require lots of staff for managing the crowds, along with site prep and clean-up (and most of the staff are usually salaried town office workers who groan about how they need to then work on what would otherwise be their weekend off, not to mention how firework events are obviously held at night).

Way too many matsuri in Japan (noit just fireworks), especially those in less urban areas, that started when the country was booming in the bubble era are now struggle to maintain things with both the costs and the staffing.

I suspect that the national government has previously subsidized them as part of "chiiki okoshi" but may be less willing to do so now.

It was twenty years ago, but I went to one in an inaka non-tourist town where they'd set off about fifty and then announce "the no. 2 Star Mine is sponsored by Tanaka Building, Shimizu Trading, and Yamamoto Car services". It would then start again before another announcement that "the no. 3 Star Mine is sponsored by Yamada Trucking, Suzuki Juku, Dandy Hairdressing, ...."