“But after I am raised up,
I will go ahead of you
μετὰ δὲ τὸ ἐγερθῆναί με προάξω ὑμᾶς εἰς τὴν Γαλιλαίαν.
This is exactly the same, word for word, as in Mark, chapter 14:28. Interesting enough, Luke, chapter 24, and John, chapter 20, but not chapter 21, have the post resurrection appearances in Judea not Galilee. Jesus said here that after he was raised up (μετὰ δὲ τὸ ἐγερθῆναί), he would go ahead of or precede them in Galilee (με προάξω ὑμᾶς εἰς τὴν Γαλιλαίαν). In the gospel of Matthew, Galilee played a predominant role. Thus, after the resurrection, it does not seem out of place as a post-resurrection reunion site.