In a large salad bowl, arrange the chopped Romaine lettuce and spring mix.
Add the chopped hard-boiled eggs, crumbled bacon, and crumbled sheep's milk feta on top of the greens in sections or lines.
Continue to layer with cherry tomatoes, celery, carrots, and cucumbers.
Garnish with Castelvetrano olives, pickled red onions, pickled peppers, and sunflower seeds.
Drizzle your preferred vinaigrette dressing over the salad, or serve on the side.
Either let other's serve themselves and add their own dressing or toss all the ingredients together until well coated with the dressing and serve immediately.