Jeff Wasserstrom writes in the Japan Focus:

The goal of the guidebook quoted from above is to encourage Chinese spending time in Shanghai to focus on visiting its “red” sites. That is, it steers them toward places with clear ties to the revolutionary past, such as the house on a tree-lined street in the former French Concession where Sun Yat-sen (1866-1925) lived out the final years of his life, and the building not far from there where, according to the textbooks at least, the Chinese Communist Party was founded on July 1, 1921 (there are competing stories about the organization’s origin).

A Red Tour of Shanghai also encourages readers to focus, when looking backward, on years associated with the “reddest” of Shanghai events. The May 30th Movement of 1925, for example, named for the date on which members of a foreign-run police force fired into a crowd of Chinese protesters, killing several people, wounding others, and triggering a general strike that paralyzed business throughout the metropolis.