I'm a parent volunteer and our school is hosting it's 3rd craft/vendor/flea market on Nov 7th also!
Since the first two shows, I've learned a lot about this type of fundraising event and there is still TONS more to learn.
A valuable resource is
www.craftlister.com
your event can be listed for free and you can search for local vendors to send invites. The site also has VERY good advice about advertising, recruiting vendors, etc.
Also, search
www.etsy.com click on "buy" then "search local" you can message invitations to local handmade crafters (don't forget to include your email address!)
Be prepared to answer emails and phone calls constantly about booth size, your advertising efforts, etc. etc.
Be sure to advertise EARLY online, newspapers, radio, flyers and signs.
I could go on and on! LOL
Hope you have a great show - Jennette