Host a virtual Craft or Vendor Fair on social media. Send out a call to anyone that wants to sell their products or crafts. Have vendors post pictures to an event page with links to purchase. Ask vendors to give a percentage of sales to the American Cancer Society or charge a fee to be included.
Bake off!
With the success of shows like The Great British Bake-Off, you should find it easy to get participants for this one! Get a panel of judges (or ask the public