Actually, I still have about 7 hours or so.
Somehow, everything got done today -- the errands, the haircuts for the boys, the cleaning, the additional laundry, the packing. And with the exception of one long linen dress eaten by the washing machine, everything came together without a hitch. (Including being able to reschedule DS1's 8:30AM missed allergist appointment -- we all overslept -- for 4PM this afternoon. That never happens!)
Our bedroom was covered from one end to the other with stuff to be packed. I spent the entire day spiraling up and down the stairs, in and out of various rooms to assemble everything, so after we put the kids to bed, all we had to do was pile it into the various suitcases and duffle bags, and that was done shortly after 9PM, which must be some sort of record.
Now I'm second-guessing some of my packing decisions, but there's no point in doing anything about it now. Off to bed -- tomorrow will be a very, very long day.