Follow the prophet -he knows the way

on this day, the class of people "Y" around the world celebrate their New Year called "X"
"Y" believe "X" represents either analogically or literally the creation of the World, or Universe.
"Y" is the start of the civil year in the Hebrew calendar .
"Y" is the first and second days of the first month of Tishrei. It marks the beginning of the. The celebration of this holiday is marked with solemnity, as it is the day on which the whole world is judged for the coming year. "X" is the birthday of the world, as it was on this day that God created Man on the 6th day of creation.

The celebration usually include a shofar(a wind interment made form Ram's horn). "X" is ordained as Zicoran Terua(The day of blowing horns)

What am i talking about?

P.S. The answer is unique, don't go around searching the net cause i doubt you'll find the answer i require.