Yes, too many to list. And they're all uber stressful, lol, so much so that I'm not sure I've got a favorite experience. The one that stands out the most might even be considered a fest. It was the William Fic Exchange I hosted years ago, because I wanted more William fic in the Buffyverse. I loved that for the creativity that was involved and for the huge influx of fic, of course, lol.
The one that intrigues me the most that I'm terrified about trying is

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Day Twenty-One
23 – When you post, where do you post to? Just your journal? Just an archive? Your own personal site?
24 – Betaing – How many betas do you like to use to make sure there aren't any major flaws in your story? Do you have a Beta horror story or dream story?
25 – Music – Do you listen to music while you write? Do you make playlists to get into a certain "mood" to write your story? Do you need noise in general? Or do you need it completely quiet?
26 – What is the oddest (or funnest) thing you've had to research for a story?
27 – Where is your favorite place to write, and do you write by hand or on the computer?
28 – Have you ever collaborated with anyone else, whether writing together, or having an artist work on a piece about your story?
29 – What is your current project or projects?
30 – Do you have a favorite story you've written? What makes it your favorite? And don't forget to give us a link!