I didn't bother with Black Friday at all- thought it would be a waste of time. I got a couple of sales over the weekend, but less than usual and less views too.
So last night (about midnight UK, 7pm EST), I thought- "let's just see...." - I added a line about cyber Monday to my shop announcement with a 10% off coupon code. I then changed tags/titles/descriptions for my TWO, yes only 2, top viewed items of the week (also my best seller). Then I went to bed.
I have woke up to 2 orders in the last 7 hours!! Only 1 has used the code, but the words "Cyber Monday" have brought almost 200 views through search in that time as well!
The changes took around 10 mins to make- and from a total sceptic here, believe me,I recommend it! :-)