Most do not, as such.
Some days celebrated to saints are not actually Roman Catholic saints, or at least were not historically. They have simply made their way into popular culture.
Several saint days are popular, and are not celebrated religiously by most protestants.
Anglican (Protestant)
As Saint Patrick was a bishop in the 5th Century and the Protestant Reformation didn't occur until the 16th Century, it is safe to say that he was most definitely not a Protestant. He was a Catholic.
August 23 is the memorial of Saint Rose of Lima.
Presbyterians celebrate many of the same holidays and celebrations as the Catholic Church. The celebrate Christmas, Easter, and the Tritium. A main difference in holiday is that they don't celebrate any saint day (exceptions include Saint Nicolas Day which some Presbyterians celebrated). They do not conform to the Catholic Church's calendar. As with most protestant faiths, they do not put great value on Marry as being a holy mother of God and so do not celebrated any holidays related to her.
Yes, St. Cecilia is still a venerated Saint in Christianity. She was martyred for her faith.
indulgences to rebuild Saint Peter's Basilica
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Yes, there is no problem if they have a true devotion for the saint.
As I understand it Orange was the color that was used to represent Sir William of orange an Irish Catholic hating protestant. I have never seen or heard of anyone wearing orange on St. Patrick's Day.
All Catholics are Christians. There were no Protestants until the 15'Th Century.
There is no Saint Calvin recognized by the Catholic Church. Calvin is primarily known as John Calvin, a key figure in the Protestant Reformation.