I put a notice at the top of the index page about three days before the upgrade letting my users know the date of the upgrade. Then, the day before I posted a notice telling then the time I would start. Then the day of, I posted saying one hour until, and 30 minutes until, and then finally took down the site. I got no complaints from any of the users about the site being down and we get about 9000 unique users onto the site a day.
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