In the US "Black Friday" is the big sale day after Thanksgiving and the following Monday is "Cyber Monday" where there's a spike in online sales (although the two are becoming one these days).

We have our equivalent of "Black Friday" in-store sales each year on Boxing Day.

This Click Frenzy thing is Australian retailers attempting to duplicate the US's "Cyber Monday" by offering a one day sale. Given that most Australian online retail stores are a bit poor, not sure how well this will go but I'll have a browse.