About the child's marriage day

Nice to meet you, Harukaze. My name is Sanuki from Shikoku.
If you look at the dates in rokuyō, they say it's not a suitable day for a wedding, but I don't think you need to worry about it.
If it really bothers you, marriage is an important ceremony where the people in question connect not only to each other, but also to each other, so why not visit the graves of both families before the wedding and ask the ancestors of both families for happiness and prosperity for both families. Even if the days are bad, I'm sure your ancestors will help you.

We use 7 days of the week, but before in China, we used 6 days of the week “Rokuyō.”
It is said that rokuyō has been used frequently in Japan since the late Edo period, but it is neither Buddhist nor Shinto.
It's fine if you think of it as a so-called folk belief fortune telling.
You don't need to worry about it at all, so don't worry.

The essence of things is that the day itself does not say what day it is.
It's something I don't care about.
Originally, there is no such thought in Buddhism.
If you don't decide on rokuyō, traders don't have a day off, so it's a useful custom in modern times, but in actual reality, there is no meaning attached to it based on human notions. That's the original state of affairs, so I don't really care about it.
When it comes to a child's marriage, parents keep an eye on them without talking too much about it.
Marriage means that children also separate from their parents. Parents should also leave their children.
Your separation from your child has already begun.
I think this is the first barrier to leaving children.
Being on good terms with your wife, not expecting a very high level, not being complacent, not imposing the values of our time, and being free to each other is a good way of being able to collide and die in the future.

DID YOU KNOW?
The days of the week (Sun, Moon, Tue, Wed, Thu, Fri, Sat) that we use normally now are meant to tell good fortune, just like rokuyō.
The days of the week are older than rokuyō, and come from the “Sukuyō Sutra,” which Kukai, the founder of the Shingon sect, brought back during the Heian period.
The sutra called the Suiyo Sutra explains ancient Indian astrology, and is said to have been influenced by ancient Greece and ancient Egypt.

In Meiji 6 (Meiji 5/12/3 to be exact), it was changed from the lunar calendar (lunar calendar) up until then to the current solar calendar, but until then, in Japan, the current seven days were not used very often, but in order to combine it with the Gregorian calendar, seven days with the same original origin came to be used.

However, originally, July (day of the week) is supposed to show good and bad,
No one says “today is a bad day of the week,” and I've never heard of it.

Rokuyō should have been convenient for Japan, which used a lunar calendar (waning moon) that calculates the year by 360 days plus leaps, but in reality, calendar notes and twenty-eight shuku were used, and rokuyō was hardly used.

It was after Meiji 6, when the solar calendar was introduced, that rokuyō became common.
(The old and new calendars have been used in parallel for a while, and in reality, it was from Meiji 31 that all calendars became solar calendars.)

The Meiji government (state Shinto) prohibited fortune telling as superstition, so detailed fortune-telling like up until then could not be written on the calendar, and the use of rokuyō, which is simple to describe, increased.
In fact, it became popular as it is now after the war, when laws changed.

The rokuyō is more fixed than the current day of the week, and since New Year's Day on the lunar calendar always starts with the first win, and leap months are arranged in the same way as the previous month.

So, telling good fortune in rokuyō
In other words, it's like saying, “Sunday is unlucky, so let's make it Monday.”

You can't really count on it, so don't worry and have a wonderful wedding that will remain in your memory.