The person in charge of an event. Though they may delegate specific aspects of the event (such as cooking the feast) to others, the Autocrat is highest authority at his/her event.
The person or Gentle in charge of running and organizing a particular SCA event. Often a great source of answers, but usually entirely too busy running the event to provide them! If you want to talk to the Autocrat of an event you are attending, try first seeing if they have a deputy autocrat who may have more time to help you.
The person in charge of running an event. The '-crat' suffix gets added to all sorts of words to identify the person running that activity.