It was a very bad year for the flu. The pathogen came in two large waves. This is only obvious in retrospect. At the time, not so much. Life went on as normal. There were gatherings. There were parties. There was travel. There were no masks. Doctors treated the sick. Traditional public health reigned as it had during the flu pandemic ten years earlier. No one considered lockdowns.
https://brownstone.org/articles/the-1968-69-hong-kong-flu-pandemic-revisited/