Basically the title. It's Olaf birthday and I really don't like him, but I don't know, it almost feels wrong to miss his birthday lol. Do you celebrate the birthdays of all your villagers? Or just the ones you like?
Villager move outs are completely random. It doesn't matter if you are nice, are mean, or ignore them. Skipping his birthday will not make him more likely to move.
I celebrate them all. It's never a bad things to collect as many villager photos as you can get and it raises friendship and has a chance of that villager sending you their photo as a thank you the following day (that's how I got Beau's pic).