On Wednesday, Jews thronged MetLife Stadium to mark the occasion, but this time, a recent nationwide wave of anti-Semitic attacks freighted the communal celebration with extra meaning.

On a windy and biting cold day, the gathering offered a chance to affirm their faith in the face of those terrible acts. Some believed the event contained echoes of Jews who were held in ghettos or concentration camps during the Holocaust and resisted their persecutors by saying clandestine prayers, teaching their children the Torah or furtively blowing a ram’s horn on Rosh Hashana.

“You can’t compare it completely, but we’re showing that we’re not going to allow these attacks to change our course, change our language, change our clothing, change our God,” said Daniel Retter, an immigration lawyer whose parents escaped Austria under the Nazis and who participated in the Talmudic study with a dozen other members of his synagogue in the Bronx.