Very odd, this was the first post I had to approve to show up, I wonder if that's a new change.
For the questions:
1: The player character will always be medium, but I do plan on having huge races that'll make the size difference extra juicy.
2: Many of the holiday events only show up during that time of the year. Most months have something extra like Xmas in December, Valentines day in February, and lots more.
3: Slime combinations is a pride month event. It's only for June.
Sorry if some of the niche content is hard to find. I really love exploration and silly secrets. If you need another to track down, try wandering around in caves all alone ;)