There's practically* nothing in this game that is missable. No matter what it is, if you're late, you can just get it later, one way or another.

*Singular, micro-lore exception, is the 3-friendship heart event of Sam. If you live in fear-of-missing-out like I do, get 3 hearts with him before winter of year 1 (plenty of time, no rush), and then go to the beach on a sunny day, for a little view of family time. Absolutely nothing lost if you don't.

But if you do that, you can feel absolute comfort that there is nothing you can miss any more in this game 😄