From where I was on our apartment's tiny balcony I must have been 50m from the fireworks. I've never heard loader fireworks than these, and I don't think it's just because I've never been so close- they were LOUD. The show only lasted about five minutes, but it was a really neat surprise.
I tried to look up what they are for, but can't figure it out, as far as I can find today isn't any sort of holiday. Actually, their independence day was last week (July 9th). I'll have to ask Cami when she wakes up.