Midnight Party goes by many names including Escape from the Hidden Castle, Hugo: Das Schlossgespenst, Ghost Party and Midnight Party. BGG Link.

The idea of the game is to avoid being caught by Hugo the Ghost in a kind of musical chairs in which a limited number of rooms (to hide in) take the place of the chairs. It started many years ago as an unofficial event, but has become more and more popular (and cultish) each year. Each round takes about 45 minutes, and it is very easy to learn how to play.

The midnight party will be run at midnight each night, usually this is located in the bar, but may be elsewhere given the new venue.