If you go online to Apple's website in the watch section, you can request a try on appointment online. The website will then ask what location you would like to sign up for and view available times. After logging in, the times will be listed. I have found that regardless of the Apple store, there are no times available after the 17th despite the fact that it has the days showing. If you wait till tomorrow when the next day appears it will have no available times. Why could Apple be stopping online appointments for try-ons after the 17th?