That is correct. But why wouldn’t a newly-Catholic couple
want their marriage convalidated? What would be their reason?
My husband and I needed to have ours convalidated before I was allowed into the church, but we would have done this anyway, because we wanted our priest and our new Catholic friends to participate in our joy of a Catholic marriage. We did it at weekday Mass, no fuss, no distractionst. And we renewed our vows a year later, again at weekday Mass with our same witnesses in attendance.
So what could be the reason a couple wouldn’t want this?