Over 100,000 people marched in London’s Trans+ Pride event on Saturday, making it the biggest trans Pride march in the world, according to The Guardian. The event’s theme, “Existence and Resistance,” was developed in response to the recent U.K. Supreme Court ruling that the legal definition of a woman in non-discrimination law is based on biological sex rather than gender identity.

“It was an emotional and powerful day,” the event’s co-founder Lewis G. Burton told the aforementioned publication. “At a time when the Supreme Court is making sweeping decisions about trans people without consulting a single trans person or organisation, and when a small, well-funded lobby of anti-trans campaigners continues to dominate headlines and waste public resources, our community came together to show what real strength, solidarity and care looks like.”

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The march began at 1 p.m. local time on Saturday and proceeded for just under two miles, from near the BBC Broadcasting House to the Parliament Square Gardens. The event’s speakers included Heartstopper actress Yasmin Finney and activist Caroline Litman, whose trans daughter took her life in 2022 after waiting nearly three years for gender-affirming healthcare, the BBC reported.

London Trans+ Pride began in 2019 as an alternative to the city’s more commercial Pride march. This year’s event gained over 40,000 additional participants, compared to last year’s crowd of 60,000, the BBC noted.

“The message was clear: We will not be erased,” Burton said. “Our existence is natural, historic and enduring. You can try to take away our rights, but you will never remove us from society. We are a part of humanity – and the public will not stand by while harm is done to our community.”

The event occurred in the aftermath of a recent Supreme Court case in which For Women Scotland (FWS), an anti-trans organization, mounted a legal challenge over the definition of a woman under the country’s 2010 Equality Act. After the court ruled that the law’s definition of a woman is based on “biological sex,” the U.K.’s Equality and Human Rights Commission (EHRC) said trans women and men “should not be permitted to use” the public restroom facilities that align with their gender.

Alex Parmar-Yee, from Trans+ Solidarity Alliance — one of the groups that marched in the weekend event — said the EHRC’s guidance “has not provided any additional clarity, and actually is going to devastate the lives of trans people [who] will lose access to essential services and spaces.”

“The main concern really here is that it feels like there’s not been a consideration of trans members of the community, and that this guidance will pass behind closed doors, without the scrutiny, and without visibility, and without democracy,” Parmar-Yee added, saying that she and other trans organizations are pushing for the government to provide greater transparency around trans-related policies and guidances.

Speaking with Attitude magazine, activist Litman expressed concern over The Online Safety Act, a newly enacted U.K. law that requires websites with explicit adult material to conduct user age checks. Critics of the law worry it’ll be used to block age-appropriate LGBTQ+ resources for minors.

“It’s really scary,” Litman said. “[My late daughter] Alice got a lot of help and support online, whilst feeling very isolated in her own lived experience world that didn’t really have anything for her. Her online world really protected her – and so both these legislations are really concerning and need to be seriously looked at for reversal.”

When asked what she would tell her daughter now, Litman said, “Find your community. That’s what I’d say – find your community. Because they’ll save you, they’ll look after you, they’ll nurture you and support you and get you through this. To do this together. That’s what I’d say to her. And I love her. Love. I love, I love, love, love, I love.”