I've spoken at quite a lot of conferences (and enjoy the design advocacy game in general), but I'm pretty sure that KOWD in Hong Kong wins the prize for best conference speaker host. I was in Hong Kong to speak about Open Data and design systems for smart cities on behalf of Citymapper, and while there got to speak with (and workshop with) some great minds from IDEO, the University of Austin and Ford Motor Group. I'd happily go back to speak again, and would recommend anyone to do so - in fact I'd recommend the conference in it's entirety - the Hong Kong Design Centre do fantastic work running this conference (alongside the sister conference Business of Design) and are really impressive advocates for good quality design practice and design advocacy in business.
Also they paid an artist to draw me. Can't argue with that can you? Especially as he drew me 10 years younger.