Hi - I love the idea, and would love to hear how it works for you. As a childcare provider, I see the potential and need! I'm still looking at the website, but I did notice a pricing discrepancy? You charge $30 more for second and third children, but $35 for the fourth child - is that accurate? Generally the rates go down per child with more children.
I was confused by the "about us" page states that "There is a minimum of six children each session and a maximum of ten children depending on site location." However on the FAQ's it states that "The maximum number of children in each session is 40 to 50."
It's probably a terminology thing regarding "session", but that popped out at me.
You state that children can attend at many sessions as are available. I'm thinking, as you stated, if a parent is attending a wedding on Saturday and would like 4 -5 hours coverage, they would register for two sessions back to back. However, the sessions don't "touch" each other. In other words, they come for the 2 - 5 session then there's a 6 - 9 session. Is there something for that hour in between?
I like that you don't reveal the location except after registration.
You likely will provide a cell phone contact number for the parents to check on their kids; make sure you have service in these locations as that would frustrate parents if they try to call and don't get answered. I'm thinking some concrete and steel buildings might hinder cell phone reception.
Your sample schedule shows three different locations on one day; do you actually need to move around the city? Can't you set up your sessions at the same place for the whole day? I know staff would be sick of the same location, but it would be easier for you and the location may give you a deal if you're spending all that time there. It would only be a problem for kids attending two sessions in one day, but I don't think that would happen often as parents would need to come and drive the child to the next location. I hope you're not transporting the kids, as that increases your liability potential.
Lastly, speaking of liability, make sure you're covered! As another poster mentioned, have a plan for kids going to the bathroom; the age group you're dealing with are VERY susceptible when out of eyesight of an adult. You also may want to do some kind of wristband thing for pickup (parents and kids have matching numbered wristbands).
I do really like the idea, and I wish you the best!