Who or what is Antifa? Do you have an address of the organization? Do you have a leader's name? Do you know when meetings are? Anything? Beuller?

There is none of the above.
“Antifa is a phantom organization operating by word of mouth.
Because there is no top-down leadership issuing official "commands," activities and tactical coordination spread organically through a mix of decentralized online and offline methods:1. Digital Activism and Social MediaLocal chapters and individual sympathizers utilize mainstream and encrypted digital platforms to broadcast information, track targets, and rally participants:Public Outreach: Groups use open platforms like X (formerly Twitter) and Reddit to publicize upcoming counter-protests, share political literature, and broadcast their views.”

“Antifa is a militarist, anarchist enterprise that explicitly calls for the overthrow of the United States Government, law enforcement authorities, and our system of law. It uses illegal means to organize and execute a campaign of violence and terrorism nationwide to accomplish these goals. This campaign involves coordinated efforts to obstruct enforcement of Federal laws through armed standoffs with law enforcement, organized riots, violent assaults on Immigration and Customs Enforcement and other law enforcement officers, and routine doxing of and other threats against political figures and activists.”

Antifa is a terrorist organization made up of the far left and not to be celebrated.