Well, my husband read an article on-line that said that they have 3 scheduled, but if this one does not good well they may scrap the rest.
If they do eventually sell tickets to the 8/28 launch, you need to go online at the exact time to get the best viewing tickets. I decided to call that morning and couldn't get through. So then I went online, I'm talking the difference between 9:00 AM and 9:05 AM. They said they had the tickets and while I was filling out the payment info they sold out. So, you need to be right there at the start time.