From the search engines and in general compared to a normal Thursday and Friday. Remember, it was Thanksgiving and Friday was when everyone went out shopping.
top as usual thanksgiving is only US based holiday unknown in most other countries worldwide US is only ~5% of global population hence if your site is a global targetting site such local holidays have no real effect on traffic at all
I started getting thousands of google referrals for a 1 1/2 year old unreplied thread on one of my forums so trafic was strange but good.