Why wait it my point? Why not just announce it whenever the parties agree with a press release? Why wait until an air show?

What are these airshows anyway? Do we have anything comparable? Is this like where the blue angles come or more like the consumer electronics convention and not really an “airshow” as I understand them? Sorry for my ignorance I just don’t follow airplanes as a hobby. When someone mentions a big foreign airshow I’m wondering how they even knew it was coming up.