From AmtWiki

An Autocrat is the person designated to run an Event. The process is different depending on your Kingdom.

Often the prospective Autocrat, or a group of people like a park or fighting company, will submit a bid to the monarch listing what they plan to do. The bid will include things like the proposed Site, the amount of money it will cost, the games and entertainments and what they will cost, a list of people that will be filling the other positions and duties.

The Event and all its results are the Autocrat's fault, be they good, bad, or ugly.