Nicole 10 said: "I have 8 tickets for the evening of August 31st. Do you think I should be fine for that date?"
If the "Scott for a week, Dave for a week, then ?!?" plan is true, then you are in the ?!? zone between Dave and Labor Day. I mean, depending on your seating preference (if you really want great onstage, high-interaction seats), you should be fine swapping to a date once they announce things, unless you want to go on the final date, which will sell much faster than the others.
If you can move up a week and get Dave, that seems like a solid, safe plan. As safe as any post 8/13 Comet tickets right now, at least... 