Another important question: do anyone know where exactly is the entrance of Reitaisai? I mean, I'm planning my route on the maps. I might stay in Odaiba overnight only to get first on the queue so I can get to ZUN's stand, so I really need to know this so it won't be all in vain.
Thank you!
And sorry if I'm a bit annoying or something, but if the station has many exits, I think we should decide in which one of them we're all going to meet.
The entrance to the queue/event will be signposted at Big Sight. Look for the kanji 例大祭 and follow the arrows. Show the staff members your catalogue and they'll let you in. The closest stations to Big Sight are Kokusai-Tenjijo (JR Rinkai Line) and Kokusai-Tenjijo-Seimon (Yurikamome), and there's lots of arrows pointing you to Big Sight from there. If in doubt, follow the crowd.
I don't know if Reitaisai does this so someone will have to clarify, but be careful showing up super early for non-comiket events, especially before the first train. Sometimes event organisers punish people who arrive too early, or stay up all night, by roping off their section of the queue, and forcing them to wait while everyone else is let in before them. Most people I know aim for 8am, so I guess if you shoot for 7:30, you'll probably be okay. Probably. (Someone more experienced than me can probably give better advice tbh.)