Startup Idea : Popup Stores

My new idea is on the promotion of short, temporary stores and finding them. When a kid opens a lemonade stand, students organizing car washes, and fisherman selling their catches they are all usually temporary things. I want to build a mobile app that allows both young and old entrepreneurs to list where they are doing business (i.e. where is the lemonade stand located?) and for the public to know about it when they go about their lives.