Yes, "Joker" (2024) was indeed intended to evoke the atmosphere of "Taxi Driver" (1976). Director Todd Phillips has acknowledged the influence of "Taxi Driver" on "Joker," citing it as a source of inspiration for the film's gritty and dark tone.
There are many religious people Jehovah's Witnesses, some Jewish and Muslims who don't celebrate the day who still manage to have fun. The origins of Halloween is one of the reasons why these individuals decide not to celebrate the day.