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At the latest Grace Hopper Celebration, "an event meant to be a career-builder for women and nonbinary tech workers turned into yet another symbol of the industry's gender imbalance after self-identifying men showed up in droves": npr.org/2023/10/05/1203845886/

I had been hesitating to link this earlier this out of concern that it might be a stealth TERF narrative, but the NPR story makes clear that no, it was "men with he/him pronouns on their nametags" taking over an event intended to be a safe and inclusive space for women and non-binary people in tech.

It's not entirely clear whether future offerings of the event can legally ban men, or even whether they want to: an organizer is quoted as saying that "male allyship is necessary". But the men described in the link don't sound like allies, and forcing or allowing all events to be governed by the tyranny of the majority is itself harmful.