The move was seen as a watershed legal moment for the city since its 1997 return by Britain to China --Online Cigarettes Store USA but the ban has done little to stop the protests or dissuade people from wearing masks.
Protesters have been circulating downloadable face masks for Thursday evening.
One shows Chief Executive Carrie Lam as Batman's nemesis The Joker, another has Secretary for Justice Theresa Cheng looking like Guy Fawkes.
There is also a mask that blends Chinese president Xi Jinping's face with Winnie the Pooh -- AA Milne's "bear Newport Cigarettes Shop of little brain" who is frequently used to lampoon the authoritarian leader and is routinely censored on the mainland as a result.
"This is not a celebration or a party," organisers of the unsanctioned protest wrote on a messaging group. "We arApple Daily, the city's most openly pro-democracy newspaper, also printed a front page on Thursday with a cutout mask of a policeman and a headline suggesting officers were now "more scary than ghosts".
A police source told AFP their presence would be ramped up around Lan Kwai Fong, a street packed with nightclubs that traditionally Newport box 100s cigarettes holds the city's largest Halloween party.
Officers would demand people remove their masks or facepaint if they were suspected protesters, the source added.