Consider this a visual reminder:
If you want an Amaryllis to be in bloom at Christmas, you need to plan ahead.
I've potted up bulbs at Thanksgiving only to have them bloom too early; others have bloomed too late. To be perfectly honest about it, you need to pot 'em up and start watering (according to the directions) in waves. That's the only way to be sure you'll hit the mark.
It's never too soon to pull out that White Flower Farm catalog and consider your options.