You know what they say...one person's trash is another person's treasure.
Yard sales (tag sales) are a great way to make money by selling items that are already in your house. You can also ask friends, neighbors, co-workers, etc. to donate stuff (old furniture, appliances, kitchenware, clothes, coats, toys, books, etc.). Chances are they will be happy to rid themselves of a few items that are just causing clutter.
You can also coordinate a Community-Based yard sale by just renting booths. Most American Legion Posts have lines in their parking lots where cars park. These make great pre-drawn out booths to rent! Rent can be $20-35 a day to $50-60.00 for a two day event!
Can you imagine renting out 100 booths at $35.00 a day? Add your bake sale goods sold along with refrehments sold plus a donation jar and you are talking about a great fundraising event.