While i agree with you 100% that the important part of commitment in a monogamous relationship is the intent and dedication of the individuals (and not the public ceremony), I have to reiterate that assuming that the marriage ceremony of Joseph and Mary didn't occur or was unimportant to the people involved because the ceremony is not explicitly mentioned in the modern NT books is disingenuous.
As said previously, the details of the Jewish wedding ceremony were already included in existing religious texts of the time, and the traditions were common at the time the gospels were written. In my mind, it is just as likely that the ceremony was left out because it was not special and didn't need to be recorded as it was that the ceremony was considered unimportant (or didn't occur at all). Using phlogistician's perfectly apt point - just because the Bible doesn't mention a mundane thing (eating, going to the bathroom, etc), doesn't mean they didn't happen.
The lack of evidence is not the evidence of lack.
On the flip side, the flexibility of the early church regarding particular ceremony would suggest to me that the details of the marriage ceremony (and many other religious rights) were considered unimportant, but the consistent use of *a* ceremony suggests to me that the public proclamation of the union was considered important. Be it Roman or Jewish, so long as the people to be married publicly voiced their commitment prior to consummation, the religion, and the society, were fine with the union.
Your stance seems to be one of your understanding of God's (rather than the congregation's) wishes. If you are therefore presuming that things left out of the Bible are as important as the things left in the Bible, you are not arguing the importance of the Jewish wedding ceremony to God at all, but the inerrancy of the Bible and the power man has had over its formation and translation over the centuries.
Why was the Talmud not included in the Bible? Why only the Torah? Why isn't Maccabees in the Bible? Solomon? The Gospel of Thomas or that of Peter? Was God present at the counsels of Nicaea and Trullo? Did the political maneuvering of Rome and the Catholic church against Persia and the Eastern church have nothing to do with what currently exists in the Catholic cannon?