The answer is: Feast of Trumpets

Lev 23:24

Ah, the Feast of Trumpets, also known as Rosh Hashanah in modern Jewish tradition! This festive day falls on the first day of the seventh month in the Hebrew calendar, and here's where things get intriguing: it is celebrated as a kind of spiritual New Year's Day! The shofar, a curved ram's horn, is blown to announce the start of this season of reflection and renewal.

One fascinating tidbit associated with this feast is how it's marked in the Jewish Agricultural Calendar. You see, it's not just about the horns and celebrations. The Feast of Trumpets comes during a time of harvest and gratitude, linking themes of gathering and new beginnings with the agricultural rhythms of life.

Interestingly, the celebration of Trumpets serves as a prelude to a serious period known as the Ten Days of Awe, culminating in Yom Kippur—distinctly, the Day of Atonement. While it marshals festivity and excitement at first, it quietly reminds participants of introspection and repentance.

Keeping in mind its ideal of self-scrutiny, the biblical command isn't merely about the trumpet's blast; it carries the resonance of an urgent call to gratitude for the past year while setting a hopeful tone for renewal in what lies ahead. It’s like a cosmic pause button invites everyone to reflect on past achievements and set intentions for the year to come—a timeless lesson that still echoes wonderfully today across various cultures!