For Jews worldwide, the High Holy Days are always a compelling mix of celebration and repentance. For many Jews in the United States, the holiday season this year will be more charged than usual. Rabbis say many of their congregants are worried by a surge of antisemitism, yet are all the more determined to worship together in the coming days. The High Holy Days begin this year on Sept. 22 with Rosh Hashana — the Jewish New Year — and continue through Yom Kippur, the Day of Atonement, which ends at nightfall on Oct. 2.