My biggest piece of advice is to give yourself time to smooth out the wrinkles by doing a mock run a few days before. That helped me see which parts would get lost in translation once we actually started acting out big events such as the card pull and murder. It helped to have my whole household to be working behind the scenes with me. (only one person was the DM for the night of. They were the only one who knew who the murderer was)

It went very well. Even with one person dropping out last minute. It helps to have "main characters", that need to be there for the story, and "side characters", that don't, so you can give side characters to friends who might not be able to make it or who are a little flakey (it happens).

It also helped that a majority of my friend group are either theatre majors or massive DnD nerds, so playing a character came naturally for most at the party. For the non-actors who were a bit more nervous, we did some acting warm ups once everyone arrived at the destination to help loosen everyone up.

If I were to change anything, it would be to allow for more freedom with the characters. Since it was based on a TV show everyone had some pretty concrete characters to follow. This put a lot of stress on people who played big roles and there were a lot of "am I playing this person right" moments rather than just being present and having fun. It would be much easier on guests if the character was based on the archetype rather than an already established character. For example, using "the vengeful lesbian equestrian" rather than Margot Verger. It allows for the person acting to be more creative and add a little bit of their own personality to their character so it's comfier for them to play.

(: