Upvote:3
Try Omatsuri Japan: https://omatsurijapan.com/search/list/
You can search by region, by date, or by both. Japanese only, I'm afraid, but Google Translate works OK.
This still lists only major-ish events, the type tourists might travel to visit. For the really local neighborhood temple stuff you'll need to check with a local tourism bureau or ask at your accommodations.