Rule number one : what to expect
Everyone talks over everyone.
Everyone interrupts everyone.
Rule number two : in practise
Regulars have adapted to the environment of rule number one. There are two modes of adaptation.
First and most common is to shout louder than everyone else and never stop mid-way through saying a sentence. People who allow themselves to be interrupted are recognised as inferiors who often nurture resentment for those who dominate the conversation.
Second and rare adaptation is to talk more quietly than everyone else. Contrary to common sense that such a voice would be drowned out in the noise, what actually happens is the quiet speech occupies an otherwise relatively empty audio spectrum and becomes the only voice ears can distinctly hear against the background speech. Strangely the people who use this effective method are often criticised for being creepy by the people who never thought of it.
Rule number three : business as usual
Everyone accepts that for the landlord, bar workers, kitchen staff, bedroom staff, it is a business, it is their work, while mostly everyone else is there for recreational purposes.
The exception are those whose income relies on gambling which may be allowed on the premises and whatever other business deals occur. There are booths and tables available specifically for this.
Rule number four : zipped lips
Under no circumstances is anybody to discuss any illicit dealings witnessed on the premises with any law enforcement authorities, especially when it is the law enforcement authorities themselves conducting illicit dealings.
Rule number five : No Fighting
The Inn has levels of protection including the biggest, hardest, nastiest bouncers you would ever want to imagine, who are the loveliest people in the world most of the time until you cross them.
There is also the magical protection including ancient curses and such. The dynamically posed stone statues in the street outside lining the front of the building are examples, according to local legend.