Currid notes that, This is the most sacred and most festive month in the Hebrew calendar.
1 As such, the day was announced with trumpet blasts, an activity that is usually for the purpose of assembling people for a major event (Psalm 81:3). On this occasion, the day is to be marked by rest in addition to the offerings mentioned in Numbers 29:1–6.
24 Parle aux enfants d'Israël, et dis: Le septième mois, le premier jour du mois, vous aurez un jour de repos, publié au son des trompettes, et une sainte convocation.