Nope, is Jul 2020 on the pretence that need to get it over so they can focus on handling the covid situation. April to Jun was the lock down.
September 2024 possible because after the National Day celebration, the "feel good" effect is still there. Dec also possible as everyone in holiday mood.
What a smart way to get the curious man to go DG MRT toilet?
Anyway, local police very busy especially after the China visa free arrangement, so u might want to contact the international police or HK 飞虎队, see if they can help?
I would think they probably do it out of boredom or just passing time while on public transport. They don't really mean to have a nice and meaningful conversation with u.