Most of the weddings I've been to have been Catholic weddings, and mostly in New England.
Usually on Saturday. Because there is a Saturday evening Mass at most churches, the weddings have to be over by 3 or 4 pm. Usually, there is a choice between, say, 11 am, 1 pm, 2 pm or 3 pm.
In the Boston area, the Catholic churches have large congregations, and it's not unusual to have 2 or 3 weddings on the same day.
Catholics can be married on Sunday, but many parishes don't allow Sunday weddings because the church and priests are busy most of the day with multiple Masses.
The only day a Catholic can't get married is Ash Wednesday. And individual parishes/dioceses may have other limitations--i.e. some don't allow weddings during Advent and Lent.