In my opinion it's excessive.

The first thing I've read is "massive pokemon fan".

Would it be different if he did that same party in anyone else's cafe?

Would he become rich just for the money he'd make in a one night party?

TPC looks stupid for me, it's not a big event we are talking about, it's not Madonna/Beyonce or Justin Bieber singing Pokemon songs in their concerts and earning millions in a single day. Was it really that big to even sue that man?

I'm sure TPC must have better things to worry about than that.

Free advertising? No thanks, here, take a lawsuit. Pokemon and Nintendo really have a problem with others talking about their products...

What the next step? We won't be able to talk about what we did in Pokemon Go?

It is the internet these days, sad state of affairs. The Harry Potter thing most likely happened past the last couple of years, and on top of that, book audience aren't as easily outraged by corporations compared to gamers unless the author is getting screwed.

At the end, this is case that party was happening using unlicensed content that was being used and created revenue (as little as it may be), something that is against the law. 

They sent a C&D letter and he complied, the BS thing is that the pokemon company didn't stop there, they continued to go after him for damages. Crazy thing is $4k is a tiny tiny percentage of the total cost of this litigation, so not only have they created negative PR, it's cost them way more than they get out of it. 

Does the pokemon company REALLY need those $4k? Was the lawsuit justified? Arguably yes, but i mean come on.