Rockstar held double XP weekends after the release of the "Liars and Cheats" and "Legends and Killers" downloadable content for Red Dead Redemption. It should come as no shock that they'd do the same to commemorate the release of the "Undead Nightmare" Pack.

Starting at 1 PM EST on October 29th, all experience gains in multiplayer will be doubled. This event will run until 11:59 PM EST on October 31st. If previous double XP weekends are any indication, the double experience will be accrued in all multiplayer and not just the new content added by the DLC.

"Undead Nightmare" adds a co-op multiplayer mode as well as a new single-player campaign. It can be downloaded for 800 MS Points, or $10.