“Commemorative” means: in honor of something—in remembrance, a memorial, observing.
Those are the kinds of words that we see associated with the Sabbath in the God’s Word: “Remember” it. “Honor” it. It's a “memorial” of creation. We are to “observe” it.
In fact the Sabbath is entirely commemorative.
Genesis 2:2-3 "And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made. And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made."