Do LEGO sets go on sale on black friday?
Retailers adjust their pricing strategy from year to year, so what happened in previous years may not be necessarily an indication of what will happen this year.

In general, LEGO offers Double VIP Points and some sets on sale (usually stuff they want to get rid off, not sets that are popular recent releases) and throws in some freebies. Amazon does their own thing, mostly competing with Wal-Mart and not LEGO directly. 

I have also noticed that in the past 2-3 years, Black Friday sales are not the best either from LEGO directly or retailers. However, the couple of weeks leading up to Black Friday can be pretty good. Again, this is not an indication of what will happen this year, it is just what I noticed in the past few years.

LEGO Technic sets, especially the large ones from the current year, rarely go on sale. So, if you can get something like Double VIP Points (basically giving you 10% off), is not bad. On Amazon, I have seen as much as 30% off before Black Friday on some of the larger LEGO Technic sets and that was considered exceptional. 

Some people missed out because they thought prices will be even better during Black Friday. That did not happen. And that brings up another point. Don't be greedy with looking for the ultimate sale and risk missing out altogether. Look at the price you would be happy with, willing to pay, and is reasonable. Then, just go for it.