Jesus' friends put their cloaks and palm-tree leaves on the road, and waved palm leaves in the air.
The event is called the triumphal entry.
The Triumphal Entry
12 The next day the great crowd that had come for the Feast heard that Jesus was on his way to Jerusalem. 13 They took palm branches and went out to meet him, shouting,
"Blessed is he who comes in the name of the Lord!"
"Blessed is the King of Israel!"
14 Jesus found a young donkey and sat upon it, as it is written,
15 "Do not be afraid, O Daughter of Zion;
see, your king is coming,
seated on a donkey's colt."
16 At first his disciples did not understand all this. Only after Jesus was glorified did they realize that these things had been written about him and that they had done these things to him.
17 Now the crowd that was with him when he called Lazarus from the tomb and raised him from the dead continued to spread the word. 18 Many people, because they had heard that he had given this miraculous sign, went out to meet him. 19 So the Pharisees said to one another, "See, this is getting us nowhere. Look how the whole world has gone after him!"
Further reading:- Matthew 21:1-11, Mark 11:1-11, Luke 19:29-44
Palm trees are a native of Israel and used for decoration at festivals.
Read Zechariah 9:9, Luke 19:38 and Psalm 118
This event may have happened on April 6th, AD32 (the 10th of Nisan)
Saturday [Friday sunset-Saturday sunset] was the triumphal entry: April 6th and 10 Nisan (at dusk)
Sunday [Saturday sunset-Sunday sunset]the fig tree was cursed: April 7th and 11 Nisan (at dusk)
Monday [Sunday sunset-Monday sunset] the conspirators counseled: April 8th and 12 Nisan (at dusk)
Tuesday [Monday sunset-Tuesday sunset]was the Last Supper: April 9th and 13 Nisan (at dusk)
Wednesday [Tuesday sunset-Wednesday sunset]was the Crucifixion: April 10th and 14 Nisan (at dusk)
Thursday [Wednesday sunset-Thursday sunset] was the Feast of Unleavened Bread: April 11th and 15 Nisan (at dusk)
Friday [Thursday sunset-Friday sunset] the women prepared the spices and so forth: April 12th and 16 Nisan (at dusk)
Saturday [Friday sunset-Saturday sunset] they all rested: April 13th and 17 Nisan (at dusk)
Sunday[Saturday sunset-Sunday sunset] morning the woman went to the tomb: April 14th and still 17 Nisan (at dusk or sunset, it became 18 Nisan-[Sunday sunset-Monday sunset])
On 14th March 445BC Artaxeixes Longimanns made a decree that the Temple in Jerusalem could be rebuilt and 173,880 days later Meshiach Nagid rode in on a donkey's colt, April 6th AD32 see Ezra 7:13-28.