I haven't been to a KH in many years, but here's what I remember.
The music is recorded. There won't be any pipe organ emitting glorious sounds.
At the front of the hall will be a stage with a lectern on it and most likely a mural of a scene from nature, probably trees and/or flowers of some sort, no crucifis or altar.
There won't be pews, but some kind of cheap chairs to sit in.
The guy who gives the public talk may be semi-literate and mispronounce and/or not understand the meaning of some of the words he is reading from the prefab "outline," which is very detailed, and not what any of my English teachers would have considered an outline.
After the public talk is the Watchtower "study." I saw an online article that compared this session as a kind of hypnosis. One guy stands at the lectern and one guy sits in a chair off to the side. The guy at the lectern asks the paragraph-specific questions from the bottom of the page of the magazine, whereupon people in the audience raise their hands to answer. The answers are always read directly from the page unless there's a pseudo-intellectual or rebellious one answering. Then the guy in the chair stands up and reads the paragraph. This process is repeated for each paragraph until paragraphs have all been covered.
People in front of you might be pinching or otherwise abusing their children. Give them dirty looks. Offer to take the child outside or give it some kind of relief from the droning drivel.
Then you will listen to a song sung in a "barking rhythm" (as described by George Orwell in 1984) and realize these put-upon people have no musical education either.
The others have told you about the love-bombing and opportunistic "friendly" gestures. Be nice to these poor, enslaved folks, but don't pander.
Then go home and drink a pint or a fifth or whatever it takes to get over what you've just been through.
I'll be looking forward to your post about the experience.