Spicy Shrimp Dip for the Super Bowl… or Anytime

Name: Spicy Shrimp Dip for the Super Bowl… or Anytime
Ingredients: 2½ lb. head-on shrimp; half peeled, half not; 1 onion, small dice; 1 large green bell pepper, small dice; 2-3 cloves garlic, minced; ¾ heads celery, small dice, divided; 2 tsp. olive oil; 1½ tsp. Zatarain's Creole seasoning; ¾ lb. cream cheese (1½ 8 oz. blocks), room temperature; 1 cup mayo (“We only use Duke's,” Quarls says); 2 tbsp. Crystal hot sauce; About ¼ a lemon's worth of juice; 1 tbsp. cayenne pepper; 1 gallon water; 1½ cups Zatarain's Pro Boil; ½ cup Zatarain's Liquid Shrimp and Crab Boil; ½ cup Crystal hot sauce; 2 lemons, halved; 2 oranges, halved; ¼ cup kosher salt (Quarls recommends Diamond Crystal)