Sarah McRobb, from Australia, who lives in Manchester, was among the fans who gathered at the bandstand.
The 30-year-old said she added some of her favourite quotes to her written tribute, which included “just random things from all different videos and just the funny moments that kind of showed the kind of person he was”.
“I just really want people to come and see this and just remember,” she added.
“Coming here, it feels like [the] closest place to be connected to Liam in a way, and everybody kind of comes here.
“For his birthday this whole thing was transformed all the way round, and we’re expecting more tributes to come in.”
Ms McRobb said the singer had been kind and was a “great role model”.
“I think the world would just be a lot better place if he was still in it.”