Tom MacWright on twitter.com:heck, with http://wordpress.org support h-entry, there are gazillions of sites on the internet with its microformats markup. is anyone doing anything with it? as far as i can tell, not really.
I know you didn’t mention h-event, but one cool (I’m biased :) consumer for h-event converts to iCalendar. https://github.com/gRegorLove/mf2-to-iCalendar. I use it on my site’s calendar page and a few client sites.
My calendar page: https://gregorlove.com/calendar/