Some certainly only celebrate Rosh Hashanah because they feel guilty otherwise, but most Jews choose to celebrate Rosh Hashanah because they want to engage with their history and traditions.
In the book "Night" by Elie Wiesel, the prisoners are unable to celebrate Rosh Hashanah in the usual manner due to their dire circumstances in the concentration camp. Instead, they silently observe the holiday by praying in their hearts and reflecting on its significance. This demonstrates the resilience of their faith despite the extreme challenges they face.
Reform Jews outside Israel generally celebrate Rosh Hashanah for only one day, while all other Jews celebrate Rosh Hashanah for two days. Reform Jews blow the Shofar on Rosh Hashanah even if it falls on Shabbat (the Sabbath), while others refrain from blowing the shofar on Shabbat.
Anywhere and everywhere Jews live.
Jewish New Year
they meet as a group to pray
Rosh Hashanah.
Rosh Hashana is the only Jewish holiday that is two days long both in and out of Israel. See the question "why does rosh hashanah last for two days"
Rosh Hashanah celebrates the New Year, the anniversary of the date that God created Adam and Eve.
Rosh Hashanah was on October 3rd in 1959.
Rosh Hashanah is the Jewish New Year.
Rosh Hashanah 2008 begins on sunset of Monday evening, September 29. Orthodox Jews celebrate 2 days of Rosh Hashanah, Reform Jews celebrate 1.