May I ask a question about lesson 1 1 in Book 1 of the new standard day?

Accurately speaking, the meaning of "ぁります" here is not so much "holding" as "owning".

Because there is a photo exhibition of friends in the nearby hotel.

Because my friend's photo exhibition is held in a nearby hotel, it can be understood like this. However, if you adopt this structure, you will emphasize the state of "holding" when you speak. "Holding" should be a passive action, so you should say "friends nearby". Therefore, I personally think that the interpretation of this Mijia teacher is not appropriate.

As for why が is used instead of を, the original sentence is followed by ぁる, and ぁる can only be added before が. There is no such usage. And as you can see, even if I switch to driving, the front of the car is still there. Simply put, this is because the subject of action is unknown. Who held the photo exhibition? I don't know, and in this sentence, it doesn't matter who owns it. And the passive front is still not connected. If you really want to use it, you can use the AUO photo exhibition to open the reminder. "~" is the subject of this action.