Prepare base guacamole in a mixing bowl. In a separate bowl, run your fingers through the crab to check for shells. Season crab to taste with Old Bay. Add half of the crab to the guacamole, along with the finely chopped celery and Fresno chili. Gently combine, transfer to serving bowl and cover the top of the mound of guacamole with remaining crab. Garnish with a little hot sauce.