When did the Resurrection -Ascension-Pentacost happen?

Many Christians wonder why we celebrate Ascension Day this time and Pentecost another time.

In some instances there are clear scriptures that tell us when what happened, in other we can make an assumptions based on scriptures.

We see that the crucifixion, burial and resurrection (3days) was during the Jewish Passover festival - Joh 19:17
Jesus rose (we call it the resurrection) on the Jewish feast of first fruits (Leviticus 23:9-10). A wave offering was made on this day during the Jewish festival. Paul calls Christ the first fruit of the resurrection 1 Cor 15:20-23

Ascension (when Jesus went to heaven) was 40 days after resurrection - Luke 24:50-53/ Acts 1:3

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The Holy Spirit (Pentacost) came 10 days after Ascension. Acts 20:16
Pentacost was previously the festival of thanksgiving for the harvest. Now the disciples harvested 3000 souls! Penta (meaning five) cost - fifty days after Passover.

The feast of weeks began 50 days after the wave offering (Lev 23:15-16)
It is miraculous how  the events of  Jesus’ life  and what he did came as fulfilment of the Jewish events/festivals that was but a shadow of things to come.

 

Heb 8:5-8  They serve a copy and shadow of the heavenly things. For when Moses was about to erect the tent, he was instructed by God, saying, "See that you make everything according to the pattern that was shown you on the mountain."
But as it is, Christ has obtained a ministry that is as much more excellent than the old as the covenant he mediates is better, since it is enacted on better promises.
For if that first covenant had been faultless, there would have been no occasion to look for a second.
For he finds fault with them when he says: "Behold, the days are coming, declares the Lord, when I will establish a new covenant with the house of Israel and with the house of Judah,

 

 

Pentecost

Meaning fiftieth; because occurring on the fiftieth day, calculated from the second day of unleavened bread. In the Old Testament it is called the feast of weeks, and the feast of harvest. Its primary object was to thank God for the blessings of harvest. See Deu_16:10, Deu_16:11. Vincent’s Word Studies