The Blue Sky Trust charity reacts to a rise in HIV infections among heterosexual women.
Hundreds of otherwise unidentified HIV and hepatitis cases are being diagnosed via A&E blood tests.
Ally Van Tillo helped start the memorial and wants to bring it back to Scotland after 30 years.
Organisers have said it is an opportunity to learn about the impact it had on communities.
The procession features speeches, candles and prayers.
Louise and Rebecca are both living with HIV and have been sharing their experiences.
On World Aids Day, Unicef's new head of HIV/Aids Anurita Bains tells the BBC that progress on HIV is stagnating for young people.
Dr Rupert Whitaker lived through the Aids epidemic in London in the 1980s.
Gay life in London was vibrant as the 1980s began, but a mysterious illness was soon to change that.
