Of all the times Danielle Bernstein has enraged the internet—and there have been many—the engagement party might take the cake. Last October, the New York fashion influencer threw a wedding-sized gathering at a historic estate in Yonkers, wearing an aisle-ready couture gown. There was a lavish cocktail hour, a live band and an outfit change, all photographed for public consumption. Ahead of the party, Bernstein posted links for dress-code-approved guest attire on social media, which would earn her commission if people hit the buy button. Brands provided free dresses and shoes for the event with the expectation that she would…