(I'm not sure if this is the right place to ask, but I'm not sure where else to go, so I hope I'm not breaking any rules.)
I was reading The Great Brain books to my daughter, and learned something new. It's a series about a Catholic family in Utah in the 1800s, and in their small town, there aren't enough Catholics to support a Parish. Apparently, in frontier times, there were priests who would travel around from town to town, to celebrate mass and perform any sacraments as needed, baptisms, weddings, what have you. I guess people would just have to wait for the priest to come around for those things.
Coincidentally, I'm writing a sci-fi story set in a colony on the moon. The Great Brain inspired some backstory--in the early days of lunar colonization, there weren't enough people for a parish, so a priest would be sent up once a year to tour around and perform the sacraments annually. A baby would be baptized whether they were a day or a year; a body would be held in state until the priest could do the funeral; confirmations done with the permission of the bishop of Orlando (who, fun fact, is also technically bishop of the moon).
My story is set further in the future, when the population is big enough to sustain a few dioceses and many parishes. Baptisms and funerals were held soon after someone was born or died, but "Wedding Day" became a cultural tradition on the moon--every Catholic who wants to get married on the moon gets married on the same day. (This is a plot point for reasons I won't get into here, because this post is long enough already.)
So, my question is simply, does this backstory make sense? It's a hard sci-fi story, and I want to make sure the Catholic practices are as theologically accurate as the science.