When can I buy tickets for Harry Potter and the Deathly Hallows part 2?

I read of mugglenet that some theatres are pre selling tickets for Harry Potter part 2. I live in Canada, and the closest movie theater to me is in a mall and a cineplex/galaxy movie theater. I looked online for information about whether or not there will be a midnight premiere but couldn't find any. Does anyone know if cineplex theaters will have a midnight premiere and/or pre sell tickets? Also are there any movie theaters holding a midnight premiere in the region of waterloo? When can I buy tickets? I am even willing to go to toronto to see this movie so information about movie theaters there will be greatly appreciated. Any information about movie tickets/and midnight premieres would be great! Thanks :)