Preheat oven to 425 degrees with oven racks set in upper and lower positions.
Pat the wings dry with paper towels and place in a large bowl. Add salt, pepper, and avocado oil, tossing well to combine. Place wings on 2 parchment-lined baking sheets. Bake for 40-50 minutes turning once after 30 minutes. Wings should be golden brown and crispy on the outside.
Meanwhile, make the dip: In a small bowl, mix together the mayonnaise, sour cream, lemon juice, vinegar, and onion. Fold in the parsley and crumbled blue cheese. Place in refrigerator until ready to serve.
Wash and cut the celery into 4-inch sticks.
Make the sauce: Melt the butter in the microwave or a small saucepan. In a large bowl combine the melted butter and hot sauce. Toss the cooked wings in the sauce and serve with blue cheese dip and celery sticks.