The mission, should you accept it, is to tell those stories and unfold that history in a lively entertaining way, to draw the visitors in and hold their imagination with your words. There is no rehearsal, you go live with one chance, this will be your first and only draft. It is a different group of people every time you open the door.
Your talk will last at least an hour, perhaps an hour and a half, at between ninety and a hundred and ten words a minute.
No notes, just the prompts from the things around you. You are passionate about it and once you start the words flow freely. Work an average, 100 words a minute for 75 minutes, 7500 words. That's a little less than one seventh of NaNoWriMo in an hour and fifteen minutes.
The challenge is fifty thousand words in thirty days.
Now tell me that my first draft should be anything less than my best.
Write your first draft as though it was your last.