Message the shop as early as you can. Most will happily move a date; a last-minute change is harder, because they've likely turned other work away.
Whether a deposit comes back is the shop's call and depends on their terms and the notice you gave. LimeLight doesn't hold your deposit, so we can't return it — but if you were treated unfairly, tell us and we'll look at it.
Didn't answer it?
Tell us what you're trying to do and we'll come back to you.