Blackjack Friday?

[Matt_just_Matt]

Ok, I've searched and found nothing (well... got lost reading other threads for an hour! lol). I remember reading about it early on in my pirating career, but seem to have misplaced that memory somewhere.
What is Blackjack Friday about? Are there prizes or something? I was in top ten of Blackjack hands won last Friday (first ever leaderboard appearance-woot!), but I wondered what lavish prizes I could have got if I had played all night.
Thanks for any help,
Maurice "Split Those Eights!" Shinmaker