The person in charge of an event The "crat" suffix gets added to all sorts of words to identify the person running the activity For example, the "feastocrat" would be in charge of the meal, under the authority of the autocrat
The individual in charge of a specific event An autocrat will defer to the wishes of Royalty, but is rarely to be interfered with, and is always addressed with gentle courtesy and patience by those with caution and good sense (There's no specific form of address -- use whatever is appropriate for the person's rank )
the person legally in charge of an SCA event You'll find that the "-crat" suffix will, rightly or wrongly, get attached to all sorts of other people working at an event, but everyone works under the authority of the autocrat
An absolute sovereign; a monarch who holds and exercises the powers of government by claim of absolute right, not subject to restriction; as, Autocrat of all the Russias (a title of the Czar)
\O-tuh-krat\, noun: 1 An absolute sovereign; a monarch who holds and exercises the powers of government by claim of absolute right, not subject to restriction; as, Autocrat of all the Russias (a title of the Czar) 2 One who rules with undisputed sway in any company or relation; a despot