DO-AHEAD TIP: Prepare cauliflower and bacon.
Place cauliflower and two-thirds of the coconut milk in a blender; process until smooth (or with some chunks, which is my preference).
If you need more liquid, add some of the chicken broth. Transfer mixture to a large saucepan over medium heat.
Add remaining ingredients and blend well (if soup is too thick, add a splash more chicken broth).
Simmer for 8 to 10 minutes or until celery, onion and carrot are tender; serve.