Sorry, not following quarantine laws is extremely selfish and at a minimum is illegal. I'm not a posek, but I know around the MO community, it's completely assur to break it.
If someone is going to break it anyway, they should wear an N95 at all times, not eat or drink near anyone, and maintain 6 feet distance. Even testing isn't reliable as it could still be in incubation period but still contagious.
The only exception to quarantine that I'm aware of is business travel for less than 24 hours. I don't think it's that big of a stretch to say being at a wedding, where people will likely be eating, dancing in close proximity, posing for pictures, as well as being in crowds of 50 people (if we're lucky and people follow that law) is far more likely to lead to spread vs. a business meeting.
There's a simple work around to attend a Simcha in compliance - quarantine for 14 days!
Someone mentioned that the weddings are fine when they were linked to 16 cases in BP. Just curious what's the death toll we're OK with on this is? If only 1 person dies from being exposed to an OOT person who broke the law, are we OK with that? Where's the cutoff?