Betty Friedan’s “100th Birthday Webinar,” produced by the Veteran Feminists of America, will be streamed on multiple platforms and will feature a veritable who’s who of speakers, including Gloria Steinem; Senator Elizabeth Warren; Alicia Garza, a founder of Black Lives Matter; and Christian Nunes, the president of the National Organization for Women, or NOW, which Ms. Friedan founded. There will be archival video footage, and two of Ms. Friedan’s children will talk about the difficulties of growing up with the so-called mother of the women’s movement. Senator Chuck Schumer will declare Feb. 4 “Betty Friedan Day.”