app for kickstarter-like goals

I'm developing a website for a non-profit organization.

They want something similar to kickstarter, only based on people instead of money.

Let's say there's an event. A birthday.

If 5 people preorder the ticket there will be a clown*
If 10 people preorder the ticket there will be a clown orchestra (in a small car)

il 100 people preorder the ticket there will be a golden statue of a clown.

I have no problem with the "buying tickets thing", but I couldn't find in django-packages anything related to milestones or goals.

Do you know if there is already something I can use? Or should I create it?

Thanks!

* if you hate clowns you can replace them with cookies

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