Ask away Shadow. I've never held one of these events and as I'm going to do this for charity I want it done right.
Ok
Setup and break down between games will take about 5-10 min without changing your books over.
Have you figured this into your time frame?
Tell all your player (if your are going the multi book route. They must have all books ready before the event. No moving cards between books. ) That is done due to time concerns.
Have you clearly stated this?
About book prereg
Let players know when reg will open and close.
Who if anybody will be confirm the books are legal?
When we did the legality checks at Gencon players got a match loss for being over cost and I required the book be corrected. then I marked the removed spells off the list.
I could go on but I think you get the idea