If we continue the theme of 'marriage':
The idea of 'getting married is only a concept.
What you choose to do with the idea is the important part: you make it what it is; you imbue the idea with meaning.
The truth is in the doing of things, so if you get married and have the entire lavish affair - that is your wedding.
Every part of the experience is the truth of it, the reality of it: the 'good' and the 'bad', the pleasure and the excess, greed and waste.
This is the actual substance of the event.
The original meaning is lost and whatever you have made of 'wedding' is the reality of the event.
If your wedding is a gaudy, vulgar spectacle then it is a gaudy, vulgar spectacle.
That is the truth of it; surface glitz and glamour smeared across the relationship in the hope of what?