The day of Trumpets is expected this year to be on Oct 3 (actual date depends on the visible new moon).
The day or Trumpets is the day that heralds the seventh month of God's calendar, announcing the arrival of the Day of Atonement and the Feast of Tabernacles.
It is known that Christ was not born on December 25. If you did not know that, guess what? There's no tooth fairy, either.
It is believed by most scholars and serious students of the Bible that Christ was born sometime in the seventh month. And how fitting: Trumpets, announcing the arrival of the King, and Tabernacles prophesying of the time when God would 'tabernacle' among His people, as the Word became flesh and 'tabernacled' among us.
So basically, if you want to celebrate Christ's birth, this next month is the
Biblical time to do it.