The rules actually encourage players running certain aspects of the game. For example, to attain a certain noble rank, it is required for a player to GM some activity like a hunt or a feast. The higher you get, the more that sort of thing is required by the rulebook. The author wants players to participate in the game directly, not merely as consumers.
The wedding between two players is a perfect opportunity for you two to run the wedding how you like. Take turns, or one of you can run it. It's not a big deal, and don't be intimidated. Keep it simply, or chose to introduce a plot twist or something - totally up to you. You can even do it like a "make you own adventure" concept where someone builds on what the previous person posted, like some story RPG games work.
So, deliver invitations to whom you wish. The Earl will not come, but depending on the delivery, he may send a representative.
We'll cut to black for the fertility rites, or at least take it off the public boards.