The same way it is celebrated today - by fasting and praying in synagogue to God.
Jesus
Rosh Hashanah was a Biblical holiday, so it was celebrated for centuries before the birth of Jesus Christ and has been celebrated continuously since then.
Since Jesus was Jewish, he would have celebrated such Jewish holidays as Passover, Rosh Hashanah (New Year) and Yom Kippur (Day of Atonement), and observed the Sabbath. He also celebrated Hanukkah, and this is mentioned in the Gospel of John in the New Testament. In addition, in the Roman empire, there were many celebrations, but Jesus would not have observed them, since they honored Roman gods and goddesses. One very popular Roman festival was the Saturnalia (birth of the Sun god).
During Jesus time boyslearnt at the temple.
She was the mother of Samuel in the Old Testament not during the time of Jesus.
No, Judas did not perform miracles during his time with Jesus.
No, Paul did not walk with Jesus during his time on Earth.
Pineapples were unknown in Palestine during the time of Jesus.
Yes, Jesus prayed with his disciples during his time on Earth.
Herod was king at the time of jesus .
Yes, it is believed that Jesus drank water during his time on Earth.
During his time on Earth, the disciples called Jesus "Rabbi" or "Teacher."