I've been making event mods for quite a while.
People generally want:
To decorate their bases (without grinding for materials -- the first Christmas forced everybody to fight for Santa drops for days, just to build a single Christmas tree)
Fight new monsters (Dodo Rex, Dodo Wyvern, Zombie Dodos, etc)
New ways to get cool loot (Santa drops, etc)
New dinos and new items, such as Flying Brooms during Halloween (like I've done in ARK Hallows Eve, etc)
Feel free to look through my mods for ideas. I submitted these for sponsorship, but there didn't seem to be any interest for some reason.
ARK Hallows Eve: https://steamcommunity.com/sharedfiles/filedetails/?id=1167006915
Dynamically generated Graveyards which have:
Erie smoke clouds with custom suspense music
Randomly generated gravestones that can be searched, revealing a custom skeleton monster or an admin-configurable loot chest.
User-configurable Glowbugs that flutter around the broom, to make it easy to find at night
Can fish while on the broom
Speed and flight/ground abilities are fully admin configurable
Can be picked up and carried in inventory after you land
Skeleton Costumes for Players
Candy Baskets (Randomly gives "Trick" or "Treat" candies. Tricks make you do something silly, and Treats give you buffs)
All the holiday skins/decorations that are fully resizable
Clown Balloons that pop when you hit hard objects. Can be used to apply Torpor to teammates, so you can put on a clown mask and jump your friends
Custom music player for the Fear Evolved theme music
Autumn Feast: https://steamcommunity.com/sharedfiles/filedetails/?id=1207997302
Added wild Turkey spawns. Turkeys are tamable and breedable.
Build the special "Double Barreled Poultry Pulverizer" (shotgun) to hunt birds
Insta-gibs Argents, Terror-Birds, Dodos, and Turkeys
When a bird is shot with the gun, no XP is given, the bird explodes in a poof of features, and it drops a custom "Bird Carcass"
Pluck the Bird Carcass for Feathers (used to craft skins, such as the Chieftain hat)
Placed plucked bird carcasses in the fryer, along with veggies, and craft Autumn Feasts!
Autumn Feasts can be placed on tables, and contain a certain number of Servings based on the size of the bird used
Players can place plates on tables, and clicking a plate will pull a Serving from a nearby feast. Clicking the plate again will eat the Serving.
Eating Autumn Feasts gives you a "Stuffed - Digesting!" buff, which slowly gives the player food/water over time as they digest. It also increases their insulation stat slightly, because they're fat now.
Holiday Delight: https://steamcommunity.com/sharedfiles/filedetails/?id=822564503
Added all of the Winter Wonderland decorations back into the game, and added some new ones.
Players can build and sit on a custom Santa Sleigh for fun/screenshots
Custom music player (Holiday Delight Wreath) plays the WInter Wonderland music
The Snowman has been overhauled to produce snow in the area, and all of his sockets have been overhauled to allow every helmet in the game to snap to his head.
Holiday Stockings have been fixed to allow player names
The gift-wrap present has been updated/fixed, and now include custom sounds/effects when opened