The City Hall
The Gathering place of the Anarchy is most often called City Hall. Rallies, Nirvana, Senate, Rant, Campfire, and the Baron's House Party are all equally used. Some domains even still use the word Elysium, saying that they are taking it for themselves.
The Rules for each one vary but typically final death is not allowed and fighting is kept to a single space prepared for such events.
Some examples
Mcneil has tried to set forth the idea that one should behave in his house as they would expect him to behave in their own house. He has no laid down rulez for his parties as such but lets it known that he will take it as a personal insult should someone take things too far in his house.
In Austin they have a very short list of rulez consisting of 1) No fighting in the general rooms. 2) No Humans in the meeting space. 3) No Killing. 4) No Dominate. Gangs are
In Venice, they use a modified version of Camarilla Elysium rulez and a general ban on all powers within the walls of the senate. Gangs enforce this on their own. Anyone who breaks the rules gives up a future vote to the wronged party. This has created a secondary boon system of Votes.