The mass protest will be held near the Russian embassy in London on Wednesday, April 12, according to Gay Star News.
A violent attack on the 17-year-old has Britain outraged.
People around the world spent their holiday weekend demonstrating against Trump.
From London to Glasgow to Tokyo, demonstrators sent a message to their governments that they oppose President Donald Trump's anti-immigration policies.
Assange has been in self-imposed exile at an embassy in London for more than four years, to avoid extradition to Sweden on sexual assault charges. He could face espionage charges in the U.S.
Stephen Port administered lethal doses of GHB to his victims; police are under fire for initially considering the deaths suicides or accidental overdoses.
Security at the supermarket had told two men they'd have to leave if they were holding hands.