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It seems that a lot of usual Summer festivals and fireworks are cancelled this year too because of COVID 😭 I've just seen that Nagoya Port Summer festival won't be held this year too.
There is a website called Aichi Now where you can check all events info for Aichi prefecture mainly but not only.
It's an official website so it's very furnished with info. I linked to the English homepage but they also have other foreign languages and if you understand Japanese feel free to check their Japanese HP, a lot of stuff there.
They also do social network which is a great way to discover nice places/events.