From what I can tell (and I know you all will correct me if I am wrong), the evening concert in Tokyo was the first time John Lennon wore glasses on stage during a concert. I have seen him in glasses during rehearsals for TV shows and he wore glasses during the NME awards in May of 1966, but that wasn't a full concert. It is easy to date these photos because you just have to look for the ones with John in the glasses.