Congrats!!

Sadly, your name is similarly confusing enough to another Chicago entity that is in a similar area of interest that they could someday file a lawsuit against you to stop you from using that name. A name doesn't have to be trademarked in order for such a lawsuit to be filed.

501(c)3 corps are a fair amount of work to get filed, up and running properly, so you would definitely need to find someone willing to do it pro bono. Sorry, don't know of anyone to help.

It doesn't stop people from being able to donate to you, they just claim the tax right off associated with the donation.

DocJohn