Prepare up to 2 days ahead. Sauté celery in 2 olive oil in a saucepan over medium heat 3 to 4 minutes until tender. Stir in diced tomatoes, garlic, Creole seasoning, and sugar. Reduce heat to low; simmer, stirring occasionally, 20 minutes. Stir in parsley, green onions, and hot sauce. Store in refrigerator up to 2 days.