There was a time, I think when the Twelve Labours contest was being held, when the contests were advertised in the column on the right side of the screen. I don't know how or through what channels that was done, but that is a place that gets the attention of people. I don't think many people scroll down all the way to the contest section. 

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Edit: since this was my first post in the thread I'm adding this: I've become contest moderator somewhere after this comment. If you have suggestions and want to post in this thread, please @ me so I won't miss it.