You missed it. The bonus is now dead.
Many people are also getting a pop up along the lines of: 'Earn x Party Points by a certain date, and get $y,' so if you haven't logged into your Party account for a while, it may be worth checking.
Standard disclaimer: I'm not trying to be rude since I answered your question, but many people would appreciate it if you used the search function before you asked question like this. The Party bonus I linked you to is discussed in 4 or 5 thread in the first few pages of the Internet Bonuses forum.