Everyone (mostly fully vaccinated) gets covid at 4th of July party

I went to a party on the 4th of July. A few days later myself and my friends started feeling sick. Then we got word that someone at that party tested positive for covid. All but one of my friends are fully vaccinated. We all go get tested, and nearly everyone at the party tests positive for covid. Interestingly the three people who didn’t feel sick all had the moderna vaccine. Everyone that had Pfizer or Johnson and Johnson however got sick. My symptoms are mild. I’d like to think that the vaccine kept me out of the hospital, but clearly didn’t protect me from getting it. Most likely this is the delta variant. Pfizer has already made an announcement saying that a booster shot is needed to protect against delta variant. Johnson and Johnson also didn’t do shit from my experience. My friend had JJ and she had it worse than anyone.

Are we really just that unlucky or are we about to see a huge wave of vaccinated people testing positive?