gRegor Morrill on gregorlove.com:I do for events on my site. Makes it easy to have human-friendly dates + machine-readable ISO8601. e.g. https://gregorlove.com/2017/06/homebrew-website-club/
calagator.org uses them, too. From the consuming side, I use https://github.com/gRegorLove/mf2-to-iCalendar to generate iCalendar from the microformats
