From the Meridian 59 Login Screen:

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M59 advancement will be DOUBLED for one weekend.

Starting:
Friday, May 4th @ 10:00 PM EST

Ending:
Sunday, May 6th @ 10:00 PM EST

Oz
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View the official M59 video here:

http://www.youtube.com/watch?v=8x3JiS6EIz0

Please spread the video around!

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Log on and enjoy building for the double XP weekend, there will also be various events on both servers throughout the day to maximize your PvE pleasure, hope see you all in game!

Source: Oz - oz.meridian59@gmail.com