@glyph @mariatta I have no idea actually, I wasn't directly in the room at the time and I don't know enough about Apple devices to know the likely details. It's possible I've got the wrong end of the stick and the kit the conference owns would have worked but was already in use. Effectively I know the lesson we took from it was to repeatedly remind speakers well before the conference to please ensure they bring what they need to connect to HDMI.