I'm working on a modded survival modpack and I am looking for mob/world "events". There's a lot of gray area in that. Things like a Blood Moon that spawn more mobs on full moons is a good example. I'm not using this particular mod however because it conflicts with Dynamic Surroundings which I want more than Blood Moon. The mob events can't be based on weather and can't change any visual sky effects like the Blood Moon does.
I love little rare occurrences in games. It would be cool to see rare and interactive happenings for people to participate in. Here's a list of my current mods so you can prevent any possible conflicts:
Ambience+, Better Animals Plus, Chisels and Bits, Extra Bit Manipulation, Cosmetic Wings, Doomlike Dungeons, Dynamic Surroundings, Fairy Lights, Ferdinand's Flowers, Globe, Project Vibrant Journeys, Rex's Additional Structures, Ruins, and TekTopia (unreleased "better villagers" mod).
Modpack is made for 1.12.2 Minecraft. Thanks for any suggestions.