Two suggestions--TMI and KISS. 7 minutes isn't long when you could talk for literally hours about quilting. Find one aspect of quilting and stop there. If your intention is to educate about quilting, you might focus on the cost and time involved. You might show a vintage quilt and a modern one just to demonstrate the difference but even that can run into more time than you are being allotted. Perhaps show the differences in the tools we now use. Explain batting. There are so many individual things that have changed that it will be difficult to shorten a speech to 7 minutes. (Too much information and keep it simple "Sally")