As dusk bleeds into the ancient city's silhouette—made famous by blockbuster films—the real awakening begins. Buy your 20 RMB wall pass by 5:30pm to witness three transformative acts: ACT I: 6:00-6:30pm — BLUE HOUR THEATERThe southwest watchtower becomes nature's proscenium. Capture the cobalt sky wrestling with amber LEDs using a tripod (30+ sec exposure). This is where Zhang Yimou's cinematography dreams are born. ACT II: Post-7:00pm — LIGHTSTRIKEThe "Full River Red" lantern array ignites along Cross Street. Shoot upward with 24-70mm—the collision of vermillion paper globes against indigo darkness will…