Startup Idea : friends plans app

Bands practicing songs, school projects, entrepreneur projects, vacations, family reunions, weddings, family/household chores, exercise/training schedules, dates, or just every day plans could be easier and funner to plan with friends. There should be an app that focuses on planning, but lets you share and invite people to the plans you make. It would also help you check up on each other about tasks that need to be done, generate ideas for the future, and prioritize. Kind of like facebook events, but more tools for planning.