The eight-day festival of Passover is celebrated in the early spring, from the 15th through the 22nd of the Hebrew month of Nissan. It commemorates the emancipation of the Israelites from slavery in ancient Egypt. Atonement.
The Torah was given by G‑d to the Jewish people on Mount Sinai more than 3300 years ago. Every year on the holiday of Shavuot we renew our acceptance of G‑d’s gift, and G‑d “re-gives” the Torah. Atonement.