Some groups held a 7.21 "Half Anniversary" rally in Tin Shui Wai with the theme "Guard the Truth, Don't Forget 185/6 = 721". At about 7:30 pm, about a hundred citizens participated, some wearing school uniforms or black clothes and wearing masks. At the scene, joint signing sessions and Lennon paintings were set up to allow participants to write their opinions and signatures. At least four police cars and dozens of police officers were seen around the rally. The rally began in the form of a drama about the citizens "39 minutes of waiting for the police at the West Rail Yuen Long Station on July 21". Rally representatives said that the Yuen Long attack reflected that the Yuen Long Police Force was unable to protect the citizens. They hoped to tell students through the rally and drama to urge everyone to defend the future together and to evoke everyone's original intentions through drama.