I've never actually played one of the Touhou shmups so I don't know, but if there's an official name for that festival, feel free to change it.
東方崇敬祭 is evidently the name of a Touhou con. Touhou Wiki lacks an article on the convention itself, but in categories just calls it Touhou Suukeisai.
That reminds me, it's almost time for the Reverence Festival...*clack*clack*I think that Patchouli with a flat chest is better than being big and busty.Even if that's what you think, that's just...