Actually, you know what I think makes more sense than "scheduling" everybody for a day?
Just begin posting on Friday, April 10th. Multiple postings each day are allowed through the 12th. Not everyone will be ready by next weekend, and rather than people contacting me and saying they won't be able to post, we'll just let people post when they can. After the 12th, we'll go to two to three (2-3) posts in a week. If we get too back-logged we'll increase the frequency.
How does this sound?