Yes and no.
Here's the facts:
You have a following of people that want you to cook for them.
You can not cook from your home and bring the food to their venue because you don'e have a licensed kitchen to work from.
You cook at people's homes with their food and their equipment.
You don't need a Chef's certificate or license per se, but a serve safe certificate from your state's health department would be prudent.
Business license and liability insurance would be needed if you intend to make this a permanent business venture.