Here's a couple things I've wondered about. When they marry what type of service do they have ? Do they go to city hall or is it less formal ?
Funerals ? Same thing. Do they even bother with them ?
Divorce ? Do they do this ?
Citizenship ? Has an outlander even been made a citizen ? ( I know there was a time when Militia or Garda were offered this for x amount of service. Not aware of any ever achieving it.
By the Gazetteer,
Marriages:
Barovians marry young, boys often by the age of sixteen, girls sometime as early as thirteen, arranged marriages are not commonly observed, but the social and economical benefits of a marriage lead many parents to pressure their offspring to marry their sweethearts prematurely. Among peasantry I would deem marriage would take place in a farm, or perhaps a village square, richer families in towns and cities would have enough material resources to spend them on more elaborate weddings.
Funerals:
Quite important I deem, for example, ethnic Barovian women wear black for five years following the death of even their most remote relation, thus they seldom wear any other color. Funeral service itself would be most likely quite informal due the atheistic nature of Barovians though.
Divorce:
Divorce and remarriage of widows is forbidden by Barovian custom.
Citizenship:
No examples I can recall, however I suppose an outlander could be made honorary citizen by a burgomeister for service of the city/count/barovian army.
That's all I can remember for now.