thanx UDUSA.Yes, I did get an official invitation containing the schedule, another attachment with directions, hotels etc.
Nope, they don't ask you to get sealed scores nor submit them there.
I couldn't get my scores in time so asked Ms Janet regarding it. She told me"you are fine, since you have sent a notarized copy of the NB-1 scores along with the application"
Clear your doubt with her before you attend the iv.
best luck for yr interview