(adsbygoogle = window.adsbygoogle || []).push({}); I was scrolling around on this newssite (Sorry if you aren't dutch, but I'll explain everything),
When I found this: Key to try Guild Wars 2 in the weekend.

This key works from fridaymorning 09:00 until mondaymorning 09:00
If you want one, follow these simple steps:
1) Create a account on gamer.nl (It's easier for foreigners to use google translate, it isn't 100% correct, but hey, it's something
2) go to this page: You must login or register to view this content.
3) Scroll down and click on the button, voila! Your key is there!

P.S. They onbly have 1000 keys in total, so be quick!