Daniel Caldwell a theosophist whose Blavatsky Study Center is a gold mine of theosophy, has a new book on those who have met Adepts or Mahatmas. It is titled
A Casebook of Encounters with the Theosophical Mahatmas. There are many cases of people meeting them.
https://www.lulu.com/en/us/shop/dani...e=1&pageSize=4