Is not this current dispensation of grace, of the church age, a mystery, that had been hid?

Where the LORD would also call Gentiles to salvation?

Romans 11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.

Colossians 1:27 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory:

Romans 16:25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,

I Corinthians 2:7 But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory:

Ephesians 3:9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ:

Colossians 1:26 Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints:

Did not this mystery begin to unfold when Peter was sent to Cornelius?

Acts 10:44 While Peter yet spake these words, the Holy Ghost fell on all them which heard the word.

  45 And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.

Acts 11:1 And the apostles and brethren that were in Judaea heard that the Gentiles had also received the word of God.

  4 But Peter rehearsed the matter from the beginning, and expounded it by order unto them, saying,

  17 Forasmuch then as God gave them the like gift as he did unto us, who believed on the Lord Jesus Christ; what was I, that I could withstand God?

  18 When they heard these things, they held their peace, and glorified God, saying, Then hath God also to the Gentiles granted repentance unto life.

But then, this mystery of the church, with Gentiles included, which began in Acts 10, does it not also complete with the blessed hope?

Ephesians 5:32 This is a great mystery: but I speak concerning Christ and the church.

I Corinthians 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,

Did Peter go to Cornelius on a feast day? It doesn't say.

But it probably wasn't, or else Peter, and those with him would have been partaking of the feast.

Instead, they end up at the Gentile Cornelius' house.

So, would the future blessed hope have more in common to when Peter went to Cornelius' house?

Rather than on a feast day that the LORD gave to Israel?

The fulness of the Gentiles began to come in with Cornelius, and ends at some point in the future, at the blessed hope?