reason, where are you considering doing this ? I live on long island and Fandango has had recent UFC events (as recent as this past summer, mendes/mcgregor), but they havent had the most recent ones so I havent gone. I went to the fandango site earlier today and it doesnt look like they have it for this weekend., Disappointed.
As for the experience when I did go, it depends on what you are looking for. no acholol in theaters in NY. And the theater was not crowded at all. there was a surprising lack of cheerring, clapping, or any emotions from the crowd. Occasionaly yes, but very quiet most of the time.
So, i liked it better than a sports bar, because no drunken patrons, and no idiot fans being borderline racist (this is while i was watching anderson vs sonnen 1). For me, It was like too much emotion at the sports bar, zero emotion at the movie theater.