The Boys From Fengkuei / 风柜来的人 (Hou Hsiao-hsien, 1983)
Ah-Ching and his friends buy tickets to a “European film” from a shady street scalper. A magical moment ensues.
Edit — Bonus points for anyone who recognizes a similar scene from Jia Zhangke’s Still Life! (In an interview conducted several years ago, Jia cited this film, along with Chen Kaige’s 1984 film Yellow Earth and Yuan Muzhi’s 1937 film Street Angel, as his three biggest cinematic influences.)