Not sure if there's a showing near you? There's a map for that.
Doctor Who's 50th Anniversary episode will be shown in cinemas worldwide, including Canada and the US, simultaneously with the show's TV broadcast. What's more, the 75 minute cinema version will be in 3D, for those of you who just can't get enough of special effects wizardry. Tickets will be on sale as of October 25th, 9am; the showing's set for November 23rd.
Not sure if there's a cinema near you that's showing it? Well, there's decent odds; there's a screening finder over here that might answer your question. It's not fully functional yet, and doesn't show much beyond the UK and Europe; more information will be available later.
The only people to be slightly squeezed are those in New Zealand and Australia; there will be 106 cinemas across those two countries showing the special, but not as part of the simultaneous broadcast. Time zones being what they are, if they were to air at the same time as the rest of the world, the show would be at some godawful hour in the morning, which clearly wouldn't do. They get to see it slightly later on the 24th, instead.
In the meantime sit back, relax, put the kettle on. There's just about a month yet to go before the show.