There is an easy solution to the problem. Get a piece of paper. Print the following neatly in the center:
The Magician: A Play in Three Acts
by NN.
* (NN = Your name).
Leave it on top of any magical notes or grimoire materials. If anyone asks, tell them it won't make sense until you have the whole play written. You will let them read it at that time if they want, but they have to provide you with constructive criticism and maybe come to the first performance once you find actors.
Problem more than solved--in most cases, will permanently solve them being curious about your papers.
All Hail the Muse
S+A