Hindi series of talks with dates (source document)
This is a major new (as of Jun 2020) source of info for dates of Hindi talks. This list seems reasonably though not entirely accurate so far and has a lot of info not seen before. Source and inaccuracies are discussed in the discussion page. Transliteration standards are not the highest but are easily navigable.
Here is the PDF: File:Hindi series of talks with dates (source document).pdf