New Living Translation
Blow the ram’s horn at new moon, and again at full moon to call a festival!

American Standard Version
Blow the trumpet at the new moon, At the full moon, on our feast-day.

Berean Study Bible
Sound the ram’s horn at the New Moon, and at the full moon on the day of our Feast.

Douay-Rheims Bible
Blow up the trumpet on the new moon, on the noted day of your solemnity.

English Revised Version
Blow up the trumpet in the new moon, at the full moon, on our solemn feast day.

King James Bible
Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day.

World English Bible
Blow the trumpet at the New Moon, at the full moon, on our feast day.

Young's Literal Translation
Blow in the month a trumpet, In the new moon, at the day of our festival,

Psalm 81:3 Additional Translations ...