I'm not an architect, but I've sat in on architecture presentations and the most rewarding feedback I've seen is "Any objections? Ok, approved".

In my current project, we hold reviews together with our customer, because supposedly they work together with us on this project (they have done nothing of value since project start).

And it's so miserable, because among us colleagues, we really don't know what everyone else actually developed, because you obviously don't want to go into deep technical discussions, nor be too critical, when the customers all sit there.

In every dev job I've ever held it's been me or one of the other devs doing demos (usually me though). Granted I haven't worked on anything truly high profile that a demo would be An Event.