Imteresting! I got an autumn feel from it too (which is why I was so set on it being Mid-Autumn Festival, lolsob). I wonder what's pinging autumn coding? It might just be a matter of 'six months since the series started' + 'new beginnings = spring'.

I enjoy the idea of worldbuilding entirely new holidays, but there's sort of a charming Definitely Not China (Cough), thin-coat-of-paint feel to the show that makes me want to stick close to our world wherever possible. (And of course the 'not my lane' issue, that one's always important.) Still, as it doesn't fit, that relieves any obligation I might feel to try to be accurate to Earth traditions.