The festal sacrifices of the seven days were to be prepared "in addition to the morning burnt-offering, which served as the continual burnt-offering." This implies that the festal sacrifices commanded were to be prepared and offered every day after the morning sacrifice.

Numbers 28:31 Parallel Commentaries

Numbers 28:1 And the LORD spoke to Moses, saying,

The offering at the feast of trumpets

Numbers 28:7 And the drink offering thereof shall be the fourth part of an hin for the one lamb...

At the day of afflicting their souls
12 And on the eight days of the feast of tabernacles

the seventh. That is, the month Tisri, the seventh month of their ecclesiastical year, but the first of their civil year, answering to our September. This, which was their new year's day, was a time of great festivity, and ushered in by the blowing of trumpets; whence it was also called the feast of blowing the trumpets. In imitation of this Jewish festival, different nations began the new year with sacrifices and festivity. The ancient Egyptians did so; and the Persians also celebrated their new year's day, which they held on the vernal equinox, and which lasted ten days, during which all ranks seemed to participate in one general joy. The rich sent presents to the poor; all were dressed in their holiday clothes; all kept open house; and religious processions, music, dancing, a species of theatrical exhibition, rustic sports, and other pastimes, presented a continued round of varied amusement. Even the dead, and the ideal beings were not forgotten; rich viands being placed on the tops of houses and high towers, on the flavour of which the Peris, and spirits of their departed heroes and friends, were supposed to feast. After the Mohammedan conquest of Persia, the celebration of this period sensibly declined, and at last totally ceased, till the time of Jelaladdin, about A.D.

1082 who, coming to the crown at the vernal equinox, re-established the ancient festival, which has ever since been celebrated with pomp and acclamations.

Leviticus 23:24,25 Speak to the children of Israel, saying, In the seventh month, in the first day of the month, shall you have a sabbath...

Ezra 3:6 From the first day of the seventh month began they to offer burnt offerings to the LORD...

Nehemiah 7:73 So the priests, and the Levites, and the porters, and the singers, and some of the people, and the Nethinims, and all Israel...

the first day of the month. The monthly sacrifices were regulated by the new moons; and it is probable that the solemn sacrifices were appointed by God, to prevent the idolatry which was usual among the heathen at this period; who expressed the most extravagant rejoicings on the first appearance of the new moon. Moses, however, used the return of the moon only as one of the most natural and convenient measures of time; and appointed sacrifices to Jehovah, to prevent the Israelites from falling into the idolatries of their heathen neighbours. In the serene climate of Arabia and Judea, its first faint crescent is, for the most part, visible to all. blowing

Numbers 10:1-10 And the LORD spoke to Moses, saying...

1 Chronicles 15:28 Thus all Israel brought up the ark of the covenant of the LORD with shouting, and with sound of the cornet, and with trumpets...

Psalm 81:3 Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day.

Psalm 89:15 Blessed is the people that know the joyful sound: they shall walk, O LORD, in the light of your countenance.

Isaiah 27:13 And it shall come to pass in that day, that the great trumpet shall be blown...

Zechariah 9:14 And the LORD shall be seen over them, and his arrow shall go forth as the lightning: and the LORD God shall blow the trumpet...

Mark 16:15,16 And he said to them, Go you into all the world, and preach the gospel to every creature...

Romans 10:14-18 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard...

Romans 15:16-19 That I should be the minister of Jesus Christ to the Gentiles, ministering the gospel of God...