Their daughter hadn't appeared in a few days and all of a sudden she wakes them up and tells them to go down?
Which part of it does not sound suspicious? Lady Melissa knew that her parents had probably forgotten their wedding anniversary, so this would be a good chance for them to be surprised and be relaxed.
Lady Melissa quickly double checked one more time, making sure that everything was in its place.
"Derreck, go up and tell my parents to go down, say that it's an emergency and that you require both their presence right away, and don't mention anything about this."
Lady Melissa said, as she pointed at everything she had prepared for her parents, wanting it to be a surprise and for her parents to have a genuine and happy reaction to the whole thing.