Yes, the entire store basically shuts down for ~2 hours so that employees and customers alike can sit together and watch the keynote. Want to buy something during those 2 hours? Need a repair? Tough. Wait till the event is over.
In all seriousness, the closest thing I've seen to any sort of in-store acknowledgement of the event was during WWDC 2013. I went to the Apple Store for an appointment during the keynote and I saw an employee have a live blog up on one of the iMacs. That was it.