I've seen it done many ways. I've seen people do a civil service while waiting for annullment to come thru (or baby to be born) then have a huge wedding for their blessing
DH's sister went ahead and had her big wedding while waiting on her anullment, then about a year and a half later the priest "brought up" the fact that they needed to bless their marriage. Theirs wasn't a big deal. We didn't even go, it was only planned a couple of weeks in advance.
They did it on a Friday after work. Just the couple, their baby, the parents and siblings of the couple, and nieces/nephews. They wore the clothes they wore to work. My MIL tells me it didn't last long, and she never even took off her coat. Then they went out for dinner.
Their anniversary is the day they were married, not that day. I think it was only brought up because they had just done the baby's baptism, which again wasn't planned very far in advance. We found out a week before, 3 days after we moved out of state. (The baby was a preemie and they didn't want the baby around large crowds when she was first born, that's why it was put off)