A few weeks ago, there was a discussion about prefecture holidays, free admission to museums, etc. Here's a blog post about the prefectures that have holidays and a little about how to enjoy the holiday. https://www.city-cost.com/blogs/TonetoEdo/GlxjX-living_ibaraki_saitama_yamanashi
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There's no prefectural day in Aichi yet but I've seen on the news that they want to create one. Project will be presented to the Prefectural council in December. They plan to make November 27th prefecture holiday, make it a holiday for public schools and create events that week such as discounts on museum admissions.
Here's an article in Japanese about it
https://www.nagoyatv.com/news/?id=016130