Microsoft has officially confirmed that the previously European-only Left 4 Dead 2 multiplayer event for silver members will now also occur in the US. The promotion begins this Friday, January 15, at 9AM Pacific and runs (screaming in horror) for 72 hours. During that same time, Last.fm will also be available to silver members. Now, if one does take advantage of this event, we have a suggestion: Please put on the Morrissey station on Last.fm and contemplate why you own Left 4 Dead 2 with a silver account? No need to answer now, just take your time and listen to some introspective tunes before answering.