this might be unhinged, but I figured out that at the beginning of that manga (Year Class 1A entered UA/All the events up to and including Deika), Shigaraki Tomura’s Birthday (4/4) likely occurred either on a Thursday, Friday, or Saturday.
In Chapter 7, All Might confronts Aizawa on the first day of classes, and he says that “April Fool’s was a week ago.”
Of course, it doesn’t absolutely mean All Might meant it exactly one week ago, but still. With this information, let’s say the first day was on April 8.
April 8 can either be on Monday, Tuesday, or Wednesday. This is because Chapters 5 to 12 covers three school days consecutively. First day was Aizawa’s test; Second day was Battle Training; Third day was when the media rushed the school.
The first day can’t be earlier than a Monday. The third day can’t be later than a Friday. Thus, those first three days of school, April 8 to 10, can only be Monday-to-Wednesday, Tuesday-to-Thursday, or Wednesday-to-Friday.
This means that Shigaraki’s 20th Birthday on April 4, four days before April 8, could only be on Thursday, Friday, or Saturday.
*
The end of Chapter 11 is when we first meet Shigaraki Tomura, who starts plotting ‘What if I kill All Might’, and this was on the evening of the day of the Battle Training (April 9).
Immediately the next day (April 10), on the morning of that third day with the media frenzy, Shigaraki Tomura is there at UA to disintegrate the gates.
*
The USJ invasion would be the next week, on a Wednesday.
It could not have been on the same first week of school because, as above, the first week’s Wednesday was either occupied by Aizawa’s test, battle training, or media frenzy. USJ invasion must happen in the second week of school, on dates April 15th, 16th or 17th.
A lot of people get hung up on the fact Dabi called spinner lizard, which is considerably quirkist, but no one ever wants to talk about how after the first and only time it happened he never did it again once spinner clearly established he didn't like it. Dabi was willing to grow as a person and learn not to use the term for his teammate after one time.
REAL BNHA FINAL PAGES LEAK:
bakugo: deku you quirkless nerd… hawks is calling, he wants your help designing the new plush pajamas to give to prisoners…
deku: oh right! i guess i better get going. have fun in combat training, remember to learn how to kill villains in one shot!
*behind bakugo we see ochako and iida sharing a kiss*
deku: ha, i guess we all saw that coming.
*deku runs into all might*
all might: young midoriya… i told you real heroes moved without thinking… and i stand by that. continue not thinking and you will be a hero no matter what
deku: wow all might… thank you!
*deku walks away holding a notebook that says “IDEAS FOR NEW VILLAIN BURIAL GROUNDS #12”*
*THE END*
izuku seeing the “nosey bitch who forces himself into everyone’s business,” allegations: alright then. i will barely speak with my plot assigned villain and refuse to even initiate any conversation, and destroy the entire themes of the manga and also my own character in the process. happy now