The Big Birthday Code

I hope everyone is enjoying the big Swag Code Extravaganza so far.  How many codes have you found?  At this point, your crossword puzzle should be just about completely filled in – it should look like this:

As you can see, just one word is missing.  If you can figure it out by 5pm PST, you’ll score 25 Swag Bucks!  Here are some hints:

-The code is two words

-The first word is 3 letters

-These two words make up something we expect you to do while you’re celebrating Swagbucks’ birthday.

-The letter before the “Y” is “Z”

Good luck!