This must have been a very sad time for the Israelites and the priests knowing that Moses will soon be going home to be with the Lord. It must have been a form of mourning. I bet Moses being at the age of 120 must have been very tired too but he still found the time to sit and tell the Israelites what will happen to them and they need to choose between the blessings and curses.
Deuteronomy 30: 19 I call heaven and earth to witness this day against you that I have set before you life and death, the blessings and the curses: therefore choose life, that you and your descendants may live.
Deuteronomy 30: 14 But the word is very near you, in your mouth and in your mind and in your heart, so that you can do it.
Moses also tells them this...Deut: 31: 8 It is the Lord Who goes before you; He will (march) with you; He will not fail you or let you go or forsake you; (let there be no cowardice or flinching, but) fear not, neither become broken (in spirit) (depressed, dismayed, and unnerved with alarm.
9. And Moses wrote this law and delivered it to the Levitical priests, who carried the ark of the covenant of the Lord, and to all the elders of Israel.
Moses takes Joshua son of Nun, a man who has the Spirit in him and lays his hands on him to take over his possition as leader of the Israelites,
The Lord tells Moses to tell these words to all Israel. I am now 120 years old; I can no longer act as your leader. The Lord has also told me I won't cross the Jordan and the Lord your God is the one who will cross ahead of you, and Joshua is the one who will cross ahead of you, as the Lord said.
Deut: 31; 6 For it is the Lord your God who goes with you; He will not leave you or forsake you.
Deuteronomy 32: 1-18 Song of Moses. Beautifully written and was recited aloud every single word to the entire assembly of Israel.