I think a lot of people go out to B&M shops for Black Friday, but still do shop online and Cyber Monday is huge! Then you have Small Biz Sat in between, so I am just doing one big extravaganza for all three days.
I will do the tags and promote on facebook/twitter. It's worth a try. I am going to have specific items just for the sale, not a coupon code. So I won't have to edit all my tags, just create some new listings as drafts and come 12:00AM Etsy time on Friday, I will publish them!