In the following web site, the Rabbi Mark Biltz makes the important distinction between the Jewish holydays and the Feasts of the Lord described in Leviticus 23.
“These are not Jewish holidays, they are the Lord’s holidays,” explains Biltz, who has recorded teaching videos, “The Feasts of the Lord,” for WND.
“As gentiles we are also joining in the wakeup call for all Jews to return to the Torah and to Hashem,” says Biltz. “This is in response to Zechariah 8:23: ‘Thus saith the LORD of hosts; In those days it shall come to pass, that ten men shall take hold out of all languages of the nations, even shall take hold of the skirt of him that is a Jew, saying, We will go with you: for we have heard that God is with you.’”
On the other hand, there are holydays that are for the Jews and not strictly meant for gentiles. Such holydays as Tu'B'av
are all about the Jews and their history and culture.
Therefore, I think the Feast of Trumpets makes more sense for the Church than the other Jewish holydays for the rapture of the Church since it is centered around both Jewish and gentile followers of Jesus.