A rogening event using NaviTabi will be held at "Reference Point Infrastructure Tourism 2019" by the Tokyo Metropolitan Surveying and Design Association.
It is held as a course where surveying persons, especially newcomers, can touch surveying reference points and historical sites, but the general public can also participate. From Japan's oldest triangle to the latest electronic reference point, there are many surprising attractions in central Tokyo. Why don't you spend a day in spring around the reference point?
Application is from the event page.