In honor of the film's 70th anniversary, Netflix Watch Instantly will stream the newly-remastered print of The Wizard of Oz, for free over 24 hours on October 3. Leading up to that day, there will be all shapes and sizes of Oz events. You can get more details on the Netflix promo page, such as:
You can instantly watch “The Wizard of Oz” streaming from Netflix for free at www.netflix.com/wizardofoz on Saturday, October 3rd, starting at 9:00 a.m. ET for 24 hours. During this time period only, Netflix members can also instantly watch the movie in high definition on their TVs via a Netflix ready device, such as the Xbox 360, LG and Samsung Blu-ray disc players, TiVo digital video recorders, the Roku digital video player, and LG HD TVs.
In the days prior to October 3, there will be a concert event in Central Park, as well as a screening at the New York Film Festival.