I am raised up,
I will go before you
ἀλλὰ μετὰ τὸ ἐγερθῆναί με προάξω ὑμᾶς εἰς τὴν Γαλιλαίαν.
This is exactly the same, word for word, as in Matthew, chapter 26:32. 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 (ἀλλὰ μετὰ 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 did not seem out of place as a post-resurrection reunion site.