The festivals of Yom Kippur and Rosh Hashanah both bring the Jewish community together because you do everything together throughout these two festivals. Examples of this are like going to Shul for longer than usual and spending more time doing Tefillah(praying) to God. You also try to be as nice as possible to people because you know that God is judging you so you want to be seen as good. One of the Mitzvot that I didn't mention above is Tzedaka which is giving to charity and this is something that you can do collectively by all doing a fundraising event for a chosen charity. These festivals are good because they help us to interact with each other as we normally wouldn't and it comes only once a year so we like to make the most of it. This can also be a time when the Jewish community come together because you give each other advice and want to spend time together and talk about the things you have done and give each other advice or comfort each other if you feel bad about something you have done.
Rosh Hashana
Rosh haShana
Rosh Hashana is the Jewish New Year.
According to Jewish tradition, God judges the world on Rosh Hashanah.
Jewish Goods stores have toys and games.
The Jewish new year is the holiday Rosh Hashana which literally translates to "head of the year".
It's the Jewish version of the English calendar.
I presume that this is a question about the Jewish festivals and not, perhaps, the Greek and Roman festivals or, farther afield, Druid and Hindu festivals. The three great Jewish festivals were then and are now Pesach (Passover), Shavuot (Pentecost, or the Feast of Weeks) and Succot (the Feast of Booths). Each of these is mandated in the festival calendars in the Torah, and on these festivals, when the Temple still stood in Jerusalem, all Jews were supposed to make a pilgrimage to Jerusalem. We also know that Hanukkah was celebrated. It is even mentioned in the New Testament as the Feast of Dedication. That one is a post-biblical holiday instituted less than 200 years before Jesus. Note that Rosh Hashana and Yom Kippur were also celebrated, but neither is technically a festival.
Rosh HaShana isn't made out of anything, it's the Jewish New Year.
Most Jewish men in a community will go the Rosh Hashana service however there needs to be at least ten adult males to be able to hold a full service and read from the Torah.
Rosh Hashana is the Jewish new year, it doesn't related to WW2.
No, Hanukkah is one of the minor Jewish holidays, despite being perhaps the most well known outside of the Jewish community. Unlike the major Jewish festivals, work is permitted on the days of Hanukkah. The High Holy Days are Rosh Hashanah and Yom Kippur.