Here is an idea to help fill the spaces in your childcare. Make yourself business cards with your area (not address) and cell phone number. Tape them to the treats you are handing out on Halloween. I give out Wagon Wheel cookies and I can easily tape a card to each cookie. The younger children that come to your door usually live in your area and will get a treat with your card attached. The older children get just a Wagon Wheel.
I hope this helps you get your business advertised. (and it is cheap)
Happy Halloween