Okay, so, technically. Technically. Masozi was supposed to stay in his room and study Mandarin, and definitely under no circumstances was he allowed to go to Monday morning shop where people might try to assassinate him.
But Wei Wuxian is very good at fighting and there are a lot of very heavy objects in shop and they can sit in the Sinosphere part of the workshop, far the fuck away from any Anglos with ideas, so he thinks this is about as safe as you can get.