One solution is to stand outside the theater and go in after the movie starts. You can have someone message you when it’s starting or listen to when the advertisements finish.
I do this just because I don't like watching trailers for movies I know I'll watch already (especially since trailers spoil more of the movie than the internet does sometimes), but taking in some in-ear earbuds (esp if they have noise cancelling) and just not looking at the screen is great if you wanna be more covert in your oddities.
