I voted for make a collection after the fest, but what I would really like would be a combination of two answers. I'm totally okay with an anonymous collection, like Yuletide or some other exchanges, but since this is a prompt fest and not an exchange, it doesn't seem necessary to have an anonymous period.

I run dhr_advent and we have a collection every year, but it's not anonymous. Everyone submits to the collection and works are revealed one by one. Could do something similar here, have everyone submit to a collection and reveal them all. The only drawback I've found is that fics are dated to the day they were submitted, not revealed. I don't think the Lucissa tag moves fast enough for fics to fall off the front page that easily, though, so not as big a problem as it could be in Dramione. XD