I used Facebook to create an event for the party, and from there was able to send out group messages (I'm sure theses were terribly annoying at times) but they helped to let guests know what was going on, as well as to send reminders for things like directions, starting times & pre-ordering food.
The hardest part of the entire planning process was making sure I didn't send the wrong character information to the wrong person! I sent out a message 3 weeks before with the basic details of the event (time, place & theme) using the following template adapted from Nick Breens site:
You are all guests at an upscale casino in Las Vegas. You have very rare tickets to the best night of excitement on the strip; the famous Elvis Impersonator. It's 8 o'clock and everyone has gathered into the swanky casino bar for the star performer, the best Elvis Impersonator of all time.
As the show starts, a gunshot echoes throughout the bar. The curtain comes up, and Elvis goes down. The casino's bar doors slam shut and everyone in the bar is now a suspect.
You are requested at the party to determine which of our friends is the murderer. Throughout the night you can talk to any of the suspects to see who they are and to determine if they are the murderer. One person will be the murderer, if you are not the murderer, you can try and trick everyone into believing you are, or you can simply hunt for the murderer.
I will be giving everyone attending a short character backstory. I encourage you to develop your character as much as you want. I have given you a lot of room to be creative with your character. The more you shape your characters backstory, the more believable it will be. Some of the character backstories that I will provide you with will contain clues which you must tell everyone else at the party. Piece together enough clues and you may find the murderer.
In order to guess who the murderer is, you must answer the following three questions;
1. Who Murdered Elvis
2. How did they murder Elvis
3. Why did they murder Elvis.
Each person will be allowed two guesses throughout the evening. All guesses will be made publicly. The first person to correctly guess these three questions will get a prize. I will be sending out your character information next week so you can prepare a costume etc. It should be a lot of fun!
I had 22 guests and so had to create a few more characters than those suggested by Nick Breen on his blog. If you do this, you need to make sure the new character stores tie in with the existing ones. I also suggest creating one or two extra characters in case you have a few unexpected guests. You can make these character roles minor, so that if they aren't in the plot the story still makes sense.
Then I sent out the characters 2 weeks before the event, and a few final reminders in the last week.
I asked Dave (the owner of the Jeonju Diner in Jeonju) if we could host the event at his restaurant. I also asked very nicely if he would be our Elvis too. He was very gracious and went all out in preparation for his role as the murdered showman. It was fantastic.