I was booked for a regular visit around my birthday, it's a less expensive time to visit WDW so I usually come for that, and when I learned about the GE opening all I wanted was to get into Oga's on the birthday (old school Star Wars fan here, when I turned 13 I had a Star Wars party, went to see the movie for like the 4th time and everything). I was going to show up at 5 if I needed to, just to do that.
I was also lucky enough to be looking when the reservations opened, so I am now getting into Oga's without having to wonder when it could possibly happen. threw in a droid build too. I'm not staying all day, just into the afternoon (birthday dinner is going to be out at Disney Springs), so I'm going to wait and do the ride after Labor Day when they have the Extra Extra Magic Hours. If it's just resort guests, we may not have to wait so long in line for the ride. and I'm going on the second day it's open and I can go in at 8 instead of 5. It is a relief not thinking about getting up at 4.
Anyway, just keep looking. I also think that past the first few opening days, you won't have any huge issues if you just want to walk in and look around. And there are going to be some cancellations opening up for Oga's and the merchandise events. If you can check every once in awhile you may be lucky enough to snag one. If you're going on the 29th, 30th or 31st you may end up having access to the virtual queue if they use it, which would be nice if you didn't get reservations for stuff.