Coronation

From AmtWiki

An event at which the incoming monarchs are crowned and begin their terms of office.

[edit] How do you do it?

Traditionally celebrated with a feast and court, and, at the Kingdom level in many kingdoms, a weekend-long camping event.

Coronations are held every 6 months. Prime Minsters are usually elected at the Midreign, thereby overlapping the term of the monarch.