Creative ways to advertise for FREE!

I need some creative noodling to happen!

This summer I have volunteered to assist with our local VBS (Vacation Bible School).  As such there is zero budget for advertising--so, how to go about some free publicity?  Ask those who are pro's!  Realtors!  Any thoughts?  Ideas?  My first idea was the local news for kids links, and I have sent off that email.  But what else?

Where do you advertise for free.  Not just homes, but in general.  I was going to link the website to mine, that is easy.  And I can advertise on facebook and such locally, and that works.  If you can think of anything please shoot me an email!  I would like to find out any tips you may have!

Thanks!