More than 3,000 teenagers from 40 countries attended a BBYO convention in what is believed to be the largest Jewish gathering since the beginning of the pandemic. A release from the organizations said the event at the Baltimore Convention Center running Feb. 17-21 focused on Jewish philanthropy and Jewish education. Speakers included Mike Posner, a Grammy-nominated singer and songwriter; Rabbi Angela Buchdahl of New York’s Central Synagogue, who fielded calls from the hostage-taker in last month’s assault on a Texas synagogue; A. J. Dillon, the Green Bay Packers running back, and Zach Banner, the Pittsburgh Steelers’ offensive tackle; Nikki Fried,...