Mine will be done in the form of a summons. I'm throwing a Murder Mystery. I will decorate as though its a morgue and issue summons to be present to identify the body. It's a who don't and a who was it done to.

Still working out the wording...something like:
Your are hereby summoned to appear ...blah blah blah. (Guess I should see a copy of a real summons.)

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Spectorized