Traditionally celebrated with a feast and court. In larger groups and at the Kingdom level it usually means, a weekend-long camping event. Coronations are held every 6 months. The proper dates for the event are often described in your kingdom Corpora. Prime Minsters are usually elected at the Midreign, thereby overlapping the term of the monarch.
 The Basic Schedule
At a coronation you can expect a few things to happen, most are not mandatory, but are common enough to list here.You will see at least one major battle game that is probably tied to the the changing of the office. A tourney; A&S and Warskills. At least one meal, in the form of a feast held before or during court. Court, where the Monarch goes on, at great length weather you want them too or not and gives out awards. The after party; where people hang out, laugh and or moan about the day's events.
 When the crowns come off
When it comes time to say farewell to the old and welcome the new each locality has it's own traditions. If you are concerned with following them ask your Old Guard about them. If not, then work out some interesting role play or otherwise with your counterparts.
Monarchs will dismiss their court, which includes their; Champion, Scribe if they have one, Herald Captain of the Guard, the Royal Guard and their Regent. If the Regent has any staff, like a Regent's Defender or any guard of their own, then the Regent should dismiss them personally. Don't forget to thank your underlings and the PM for their service. It is typically responsibility of the prime minister unseat the old monarch, and to Crown the incoming monarch. The new Monarch in turn gives authority and the symbols of office to his or her court.
 How do you do it?
To run a coronation you first submit a Bid to the Current Monarchy. They will be the ones choosing the Autocrat. You should have; a Theme, a site, a cost estimate, a basic schedule, a flyer work up, and a devoted staff. You'll need to do all of this at least three months ahead of time. If you get the bid, you'll need to start advertising to all local and nearby groups. Poke them once every few weeks, asking about gate help, feast help, or tourney volunteers. Your lists of need people will fill up and you'll keep the event fresh in their minds.
The start day of the event should dawn on a site already checked for problem areas. You should go over it to make sure the bathrooms work, there are no major ankle breaking obstacles, the kitchen or food prep area is online, ect.