How do I find out what 3d movies are playing in october

I signed up for their email newsletter on their website. I get weekly emails that go into my gmails promo junk mail folder. They are usually about the up coming movies, times, 3D, IMAX etc. Plus got a coupon for free small popcorn.

Or you can check out the IMDB website or mobile app.

I agree with carey sign up for weekly newsletter or go to web site