Yes. It seems that the Hakurei Shrine is hosting. One of the main goals is to bring humans and youkai together, apparently.

There is an explanation for this...

Sorry, I don't quite understand. Have you all been watching Outside World soap operas or something?

Alright, what's the racket out here?

RAIKO! WHICH OF US WILL YOU CHOOSE!?

...Oh, it's the poltergeists and the Tsukumo. What's up? Rare to see you girls together.

H... Huuuh—??

Hee~ A spring festival, you say. And youkai can participate too?