Kay,
The 28th-- when is your lease up at the current place? Will you be able to move in before the lease is up?
How far is the old place from the new place?
I know that you hoping for a clear date to notify people who will help with the move.
I've moved a kazillion times:
The old place does not have to be perfectly clean and the stuff does not have to be perfectly packed.
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The dates matter from my experience but maybe the old place would give you an extra day.
Packing make sense. You have control over that and it is progress on getting
into the next place.
I am sorry that you are going through so much thinking and planning and
hoping and working. It will be a relief when it is over and you are
happily in your new place.
Above all, take care of yourself
M