Hi. I hope you don't mind me jumping in here and commenting. I'm an FK fan who is always interested in more fanworks, and someone pointed me to your journal as a way to keep up on new stuff. So I'm subscribed. :)
In addition to the communities you mentioned, there are a couple of other places here on DW where you might promote the fest should it happen again - and I hope it does. I don't have the chops to write for this fandom so I'm hesitant to play, but I do enjoy reading the fics that go up and rec them where I can, as well as leaving kudos and comments. :)
Some comms where you might promote if you haven't already:
Also, you may want to check with the mods of communities like smallfandomfics. I believe that one in particular allows people to promote other comms, but maybe double check. There is a forever knight tag on there, so it definitely qualifies. Also shes_awesome for fics focused on female characters. You may also check in with the mods of the various bingo comms, as lots of people like to cross fill challenges.
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In addition to the communities you mentioned, there are a couple of other places here on DW where you might promote the fest should it happen again - and I hope it does. I don't have the chops to write for this fandom so I'm hesitant to play, but I do enjoy reading the fics that go up and rec them where I can, as well as leaving kudos and comments. :)
Some comms where you might promote if you haven't already:
Also, you may want to check with the mods of communities like