An interesting larp from the UK: Pride Without Prejudice, a gender-neutral Austen larp set among the Ton at the final ball of the 1811 Season:
https://amymariemason.wixsite.com/pride-no-prejudice
It uses player-generated characters, and the players are encouraged to organise themselves into families. But there’s also good background material on Regency etiquette and entertainment - including rules for speculation and lottery, two games which feature heavily in Austen’s novels.