This is kinda pointless, because Comiket 78 will be held before this event, but the fact that there is a second Reitaisai in the same year...
Google translates that the page will be updated as new information becomes avaliable.
You might want to look into blogs of your favorite circles to see if they wrote anything to that extend because that downloadable pdf file looks like a form for registering for the event as a circle.
AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
*gioia e gaudio
TOUHOU SHANIKUSAI: the Great Story by Hi-Ki Production (Kira.Lu & Hikari) [sito/forum/DA]
⑨ ゜3゜-===<( ~BZZZZZZZZZZZZZZZ Regular play (latest in red and italics) Normal 1cc - PCB (ReimuB, SakuyaA), MoF (ReimuB, ReimuC) Pic Shooting - StB (All Clear up to lv8), DS (Aya: All clear up to stage 8, Hatate: All clear up to stage 6) Now playing - PCB (ReimuB, Hard), MoF (MarisaC, Normal + ReimuC, Hard + ReimuB/C, Extra), SA (ReimuB/MarisaC, Normal), Fairy Wars (Extra Unlocked, playing on Normal) Tournament Achievements
(stage 3, MarisaB)