In the true story of the Preston School of Industry, the initial establishment was a key event. This created a place to house and reform juvenile delinquents. Over the years, there were likely events related to the expansion or improvement of the facilities. Another key event could be the introduction of new rehabilitation philosophies. For instance, if they moved from a more punitive approach to a more rehabilitative - focused one. There may have also been events where the school interacted with the outside community, like when they started involving local businesses in the vocational training programs for the boys. And, any major scandals or revelations about the treatment of the inmates would be significant events that shaped the school's history and its subsequent development.
One key event was its establishment, which was a significant step in dealing with juvenile delinquency in California. Another important event was likely the implementation of different educational and vocational programs over the years. There were also probably events related to changes in management, which would have had an impact on the inmates. And, events related to any investigations into the conditions or treatment of the boys at the school were key as well.