Shrike's never heard of a festival--holiday--quite like that. Though admittedly, he's not precisely well-versed in them, either. Just that there's festivals and feasts people have at certain times of year. He struggles a little to fully understand the appeal thanks to that lack of first-hand experience.

"I see..."

It might be interesting to see, he supposes, if he ends up staying here that long. But it's still hard for him to get excited about things that involve doing much with other people.

"I didn't know there was so much stuff here."

On top of everything to do with Pokémon, he means. It's very possible he's still feeling overwhelmed by it all.