The free period begins at 12:01 am Pacific time on Thursday and ends at 11:59 Pacific time on Sunday. Microsoft says:
"The Forza Motorsport 5 weekend will allow you to check out the full Forza experience with special in-game challenges, play against others online and build your achievements and Gamerscore. Throughout the weekend, you will have the chance to compete in a special multiclass endurance in-game race event, Grand Tour of Prague. Complete this endurance event and drive at least 130 miles in the race to earn a new title and badge for your Forza Motorsport 5 profile. After the weekend, you'll have the option to purchase the game online from the Xbox Store or visit your favorite retailer and continue playing. You will also get to keep your Gamerscore and achievements earned while playing, so invite your Gold friends to play and see who has the best driving skill."
The free weekend is part of a promotion for the upcoming spin-off game, Forza Horizon 2, which will be released for the Xbox One on September 30. Will you be playing Forza Motorsport 5 for free this weekend?
Source: Xbox Wire