A modern civil war won’t be like the 1860s with battle lines.

We’re looking more at a “He has to get it right every time, we only have to get it right once” situation. Lone wolves or single person attacks with outside benefactors are likely to be more common than formations of troops.

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I mean, it’s a wedding.

If part of your culture is firing guns in the air as celebration, I might not get it, but I can support that it’s a cultural tradition.

That being said, some people do fireworks in the US to celebrate weddings, it’s not like they have a pile of old gunpowder that they just set off in the middle of the crowd. Guests, or the couple, will supply the celebratory munitions. I feel like the host could have just bought a crate of common caliber blanks and left it in a corner.