The first called Feast of Trumpets which is called Yom Teruah. In modern-day Judaism, this feast is also known as Rosh Hashanah celebrating the Jewish New Year. The Feast of Trumpets in the Bible is found in the book of Leviticus whereas, God instructs Israel to have a holy convocation, a rest and a blowing of the trumpet. His word came to existence on that same date later with 10 commandments on mount Sinai with Moses. Ref. Exodus 19:10-11, 16-20.
The next fulfillment will be upon the return of our Lord Yeshua Jesus, our Christ savior.
1 Thess. 4:16-17 The next time Heaven blows the trumpet, it will be a signal of the return of Messiah.
On mount Sinai, the Lord revealed His Glory with a trumpet sounding from Heaven before three million Israelites at the base of mount Sinai. Only Moses went up to meet the Lord but all others remained trembling in fear.
The Feast of Trumpets is a prophetic picture of the rapture when Jesus will return with the blowing of a trumpet from heaven. Those who are not prepared to meet Him will tremble in unspeakable fear. But those of us who are ready to meet our God will ascend, be (caught-up) and meet Messiah in the air just as Moses ascended high up on Sinai to meet Him. AKA: The Rapture.
I am not saying it will happen that very day because only God knows the day and time. I do encourage all Judeo-Christians to remember this Holiest day of the year with fasting, prayer, increased charity and thoughtful repentance because these holy days are important to God, he asked that we do so and we should honor Him but not in a Jewish ceremonial way but through Jesus His son.
"Remember the law of Moses my servant, which I commanded to him in Horeb for all Israel, even statutes and ordinances." Malichi 4:4
The 10 Days of awe is a personal short season of more self introspection and repentance. It coincides with Yom Kipper. The holiest day of the year in Judaism. Jews observe this holy day with fasting, prayer, increased charity and repentance.
It includes 10 days of self-examination which is the 10 days prior.
Again, as Judeo-Christians, we do not live by the laws of the Old Covenant but those who are Apostolic orthodox are mindful of being instructed not to forget His divine calendar. Ref. to the book of Malachi 4:4