Many scenic spots in Nanjing have volunteered to come to this position, mainly as tour guides to explain to tourists free of charge. I work as a volunteer commentator in Nanjing Meiyuan New Village Memorial Hall and go there for half a day every weekend. For example, Sun Yat-sen Mausoleum and Nanjing Paleontology Museum all have such volunteers.
There are also some nursing homes that need volunteer services. That's all I know ~ ~