I have! Was invited by a friend. Decided to go to be supportive (staunch atheist/ex-Christian).

It...was...pretty terrifying. The prayer music?? was extremely loud. An immediate culture shock once I walked in. I was expected to not wear shoes and leave them. Other people were rude (a lady sat down with her shoulders touching me when I was taking off my shoes, she didn't even say hello). The floors were cold cement. Dirty sheets thrown down around to sit on.

Children ran around being interrogative. I was asked to cover my (what I thought was appropriate) dress and stockings with a shawl.

People weren't talking to each other. Everyone sat silently or were in huddled small groups. There were pictures of some important men hanging on the walls.

I was given some food from a metal prison-like plate, no utensils or water with it. I didn't know how on Earth to eat without a drink or a table or utensils and I had a baby in my arms. Everyone ate from the same food which was at a type of buffet table in the basement, but people just ate whenever and didn't eat all together at the same time, which was different culturally.

It doesn't sound bad but the mood was oppressive and my friend who was an adult was clearly afraid to break a rule. A child sanctimoniously shamed me so I told her off. Her mother didn't even look our way.

Upstairs was where there was this big book monument thing. The men went up to pray to it, there was a man in robes or such who was doing the very loud prayer music. It made my brain feel dizzy even though no one was doing anything but sitting.

It wasn't fun and will not do again. Nothing bad happened to me though. I was mostly ignored. What made it feel scary was how unfriendly people were to each other (not to me). People didn't seem to worry about meeting each other or having a nice social event.