Preheat the oven to 350 degrees F.
In a large bowl, add the artichoke hearts, mayonnaise, hummus, feta, kalamata olives, Castelvetrano olives, pimientos, sour cream, parsley, garlic, 2 cups of the Monterey Jack and 3/4 cup of the Parmesan and season with salt and pepper. Fold to combine. Spoon the mixture into an 8-inch baking dish. Top with the remaining 1 cup Monterey Jack and 1/4 cup Parmesan.
Bake until the cheese is melted and bubbly, about 25 minutes. Cover and take to the party!