Can I write about this for my Georgetown Essay?

Hello!
So the prompt my question is on is: In the space available discuss the significance to you of the school or summer activity in which you have been most involved.

So the problem is, I want to write about the online business I started up with a friend, but it really isn’t a “school or summer activity”. Conversely, I can talk about my science research project which fits more along the lines of a school activity, but I’m applying for Computer Science so I think discussing a website I made would be a better fit.

What do you think?