Seasonal events in Catch 'Em Cord: how they work

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A few times a year the game dresses up for a while. An event has its own window, and when it closes, what you caught and earned is yours to keep.

How an event works

An event opens and closes on a date. While it’s open, /help gets a topic for it and the official server announces what’s going on.
An event can bring its own research story. One you started keeps going; a timed one leaves with the event. See Special Research.
/leaderboard gets an extra board for the event, and the weekly Server Challenge runs themed goals.
Nothing from an event is ever sold. Supporting the bot doesn’t get you an event Pokémon either.

The first big one ran through October. What it had:

Costumed Pokémon in the wild. Catch one and it keeps its costume for good. Costumed Pokémon can be traded or listed on the Market, a very rare few were shiny, and they can’t breed.
Trick or Treat, once a day with /trickortreat or the pumpkin button on /daily. A treat was pumpkins for the Candy Jar; a trick was a wild Pokémon jumping out at you.
The Candy Jar, shared by the whole game, with goals that paid everyone who helped and changed the event as they landed.
Your Lantern, your own pumpkin ladder, and the Jack-o’-Lantern card color for anyone who put in enough pumpkins. It’s yours to keep: pick it with Card color on /stats.
Darkrai: his Special Research opened when the jar hit its first goal, and it stays open for everyone, even now.
The Long Night, a timed research story that left with the event.

More seasonal events are on the way. When one is announced it goes in the patch notes and the official server first.

Keep your eyes peeled for the next one!