This past December, I had the pleasure of attending a conference in Assisi, “The Feast of the Mystery of Creation: A Deeper Catholic Exploration.” The theme of the conference was the same as the earlier Assisi gathering held in March 2024: the possibility of establishing a universal feast on September 1 celebrating God’s act of creating.1 The December conference, however, had a specifically Catholic focus, as evidenced in both the arguments made and the identities of the attendees (e.g., Vatican officials and Catholic scholars). The discussion continued exploring the arguments identified at the March meeting. For example, participants noted that the feast is needed in order to address a liturgical lacuna: God’s act of creating is the one major belief of the Nicene Creed (“maker of heaven and earth”) without a corresponding feast day celebration. Also, many observed, it would be quite an ecumenical achievement were the Catholic Church to establish the feast, given the prominence of September 1 in the Orthodox communion and the fact that Anglican, Methodist, and Presbyterian communions have already begun preparations to include it as part of their own liturgical calendars.