Many in the Jewish community are urging Mamdani to do more to ease their fears.
Organizers say more than 3,100 events have been registered in all 50 states and several other countries, with more than 9 million people expected.
'No Kings' protests are planned in New York City and the Tri-State area on Saturday as part of a nationwide effort expected to draw millions of people.
The vast majority of students Bellport High School staged a walkout in support of their teachers on Wednesday, protesting their superintendent's proposal to cut dozens of jobs.
Despite civilian casualties of wars in this campaign, the organizer of the 'Make Iran Great Again' rally says it is worth the price.
Duelling groups of pro-Palestinian and pro-Israel protesters clashed in Times Square on Friday.