For this weekend only, Microsoft is hosting a free multiplayer weekend for Left 4 Dead 2. What does this mean? You don't need to have an Xbox Live Gold account to access Left 4 Dead 2's multiplayer features. That's right: You will be upgraded from Silver to Gold for free. You can go online alone or with a split-screen friend. This event starts at 5pm GMT Friday, January 15th and ends at 5pm on Sunday the 18th.