It was the laying of the foundation stone of the Eye, Ear & Throat hospital on Western Road. Unlike the event centre, the building was completed in a little over 3 years and originally had a garden on the roof. Fresh air being a helpful cure for all ills at the time. I wonder did any visually impaired people ever fall off the roof!
I didn't know there was a differentiation between Mayor and Lord Mayor. I'm surprised the "Lord" part wasn't dropped after independence. On Wikipedia there's a list that begins with Provosts of the city from 1199 and Mayors from 1273.