ok, let me try something, and you tell me if it works for you.
"The Church’s calendar includes the feast days of several of the great figures of the Old Testament (though observing them is not obligatory): King David on December 29, for example, or Melchisedek on August 26. Abraham’s falls on the same day as John Henry Newman’s, October 9."
N.B. the above paragraph is copied from the text of the OP.