That's a cool location. You have some spectacular mountains around the city.
I've not been to a music fair recently. I went to a guitar one a few times with a friend. There's a big drum one in the UK that I'd like to go to. A friend of mine was just at the huge NAMM show in the US, but he goes regularly as he is in the industry. I expect you get some local stars at your show.
I know the noise can be intense and earplugs are useful.
Did you buy anything?
RE: Second Music Exhibition in Tehran at Milad Tower | A Video by @davidfar