chocolateboxcomm, a multi fandom art/fic exchange, has
opened sign-ups until January 7th, 11:59 PM EST.
idproquo is now accepting nominations until Jan 7th, 10 PM EST. Find out more details
here.
inkingitout is a yearly writing challenge where participants sign up and challenge themselves to write at least 75k words.
Sign-ups close in a few hours.
snowflake_challenge is a fandom related posting challenge that runs through the month of January.

fancake, a community where you can rec fanworks based on a theme of the month has revealed their new theme, which is essential starter recs. They're even taking requests in the comments of the post linked in the picture.
Fandom Specific:
ksspringfever, a Kirk/Spock comm, is hosting a
Spring Fever Fest and are now accepting prompts/sign-ups until January 20th.
cap_ironman, a Steve/Tony comm, is running their annual Reverse Bang and is now
open for art submissions.
no subject
Date: 2022-01-02 07:06 am (UTC)It must've been just temporary glitch or something when I was on, because yeah, I did go back just now and it's all working fine. That's good at least. Thank you for the suggestion!
Yeah, true. I don't know the specifics but you're right that they were mostly on their own shows. I always think of crossovers as fandoms that don't intersect but then again, it really is just separate main characters. And I think it is perfectly fine if you put that note. I once got a Smallville fic with the Arrowverse Justice League and now I just have DNW'd Arrowverse in my SV sign-ups just in case, even if Smallville isn't considered part of it.
no subject
Date: 2022-01-02 07:22 am (UTC)I guess it depends on the context. I think with all of these shared universe shows and movies, the definition of crossover has varied a little.
I will certainly consider it! I will wait until the end before I decide to sign up. I wonder why they put nominations at the end of the year? There were some things I didn't get around to adding because I completely forgot.
And the Arrowverse Justice League in a Smallville fic? Why?! My head hurts just thinking about it.
no subject
Date: 2022-01-02 07:37 am (UTC)Yeah, true, especially with the MCU being such an umbrella.
There's certainly time and you can see if anyone has any requests that interest you too! I have no idea about the noms. I have never done Chocolate Box before so maybe it always starts around now? I think it might be a 'right after Yuletide' situation but don't quote me on that one.
IDEK- I had the same reaction. I was like "why is Felicity being referenced and not Tess?" Also they threw in Barry/Caitlin/Cisco being a thing and I legit was so annoyed. They even got Clark's eye color wrong! Like how. I emailed the mods for the Mistletoe Exchange to ask not to be matched with that person when they signed up because I didn't want a repeat situation.