I used to acquire stories for a small publisher, and throughout a year we'd hold several special calls for shorts. It's fun to make up themes for these calls, and a challenge to do something another publisher hasn't done. Ten years ago everybody had a Zodiac and/or Tarot line - it was insane. One thing I found amusing about calls was the last minute slide under the door, when authors submitted stories almost at midnight of the deadline.
I'm about to commit that last-minute slide myself. I'm looking into anthologies that want shorts of about 5k (if you've followed new of another publisher, it's related to that). There's a deadline this Friday and I'm almost done with an MM short to send. If I don't make that book, I plan to use it toward another Coming Together contribution.
Coming Together has a line called "Treasures" which takes all the contributed shorts from one author into a collection benefitting charity. I have two MM stories out soon which total about 15K. I'd need 20K minimum for digital, 50K for print. Print's not a concern for me these days, but a large collection would be nice, so I plan to write a bit to make this happen. Only thing left is to decide on a charity.
We donate often to cancer-related organizations, and to homeless shelters. Because a collection would be all MM, perhaps an LGBT-centric charity would work, too. I suppose I can muddle that while I write. Suggestions welcome.