Among othet things, I've stumbled my way into being a high (over) paid crowdfunding expert who also trains / certifies people to be high (over) paid crowdfunding experts. I looked at your site, the following advice will be your highest leverage IMO.
By the way, this is easy, just do it. It's the holidays, people are generous which is also going to help you.
1) Look at your school list and identify the most in need school. (1 min)
2) Identify a top level professional services firm in the geographic market that has an interest in education / philanthropy. (15 min on google or less)
3) Call / email the most senior person you can and ask "are you still intersted in creative ways to help Chicago students? (10min)
No? Is there someone are your firm who is? (Repeat)
Yes?
"I'm builing this new mentorship program to a school in Chicago, and I'm relying on a local firm to underwrite (key word) the cost of the program via sponsorship. So far I've raised $17k and have 5 days left to raise the additional $10k. Based on your commitment to education and mentorship, I thought this would be a great opportunity. In addition to helping, there will also be a press / media opportunity and we'd invite you to one of the schools as a guest speaker if you were interested."
Try to close them for $10k (create a $10k entry on the Indigogo page) but settle for the $2,500.
Of course, take anything they give you, and ask them to share it with their networks..
Repeat this until you have the $10k in funding..
If you get 10 senior people on the phone, you'll close at least one of them. aim to talk to 10 people a day for the next week and you'll be good.
Also, before doing any of this, email all your current donors and ask them to "Double Up" their donation and maybe throw in some additional perk for doing that. They have already given you $$ and are more likely to give again.
It's too late in my option for scrambling for Press (that is a T-30 or 60 days process). But if you have any media connections, sure let them know - but at this point tactical selling of the big ticket items is your best bet.
Good luck! If this was useful at all or you want more detail hit me up at Anthony @ 175g . com