This is the Jewish New Year celebration. It takes place on the first day of Tishrei, which is the first month of the civil year (although the 7th month of the ecclesiastical year) and is said to be the anniversary of the creation of Adam and Eve.
One of the customs of this celebration is eating apples dipped in honey to symbolise the wish for a sweet New Year. Another is the founding of a horn (known as a shofar) which is a call to repentance in remembrance of mankind’s first sin. The horn is sounded 100 times over the 2 day festival unless the first day falls on Shabbat.
No work is allowed on this day and Jews spend much of the time in the synagogue. Rosh Hashanah is a time for self-reflection, for asking forgiveness for wrong-doings, and for planning to be better in the coming year.