Build me an app

This is an app where users can signup or sign in with Facebook and then they have their own profile in the app that they can edit the profile picture and description, and include links to their social media accounts if they would like. There is also a page called "Places" and when you click on this page it shows you three places with a photo of each. The first is "Saigon, Vietnam", the second is "Hanoi, Vietnam" and the third is "Da Nang, Vietnam". I should be able to add places in the future easily and change the names and what not. When you click on a place it will show you upcoming activities in that place. And users can add activities for each place. For example, if I click on "Hanoi" it will show me the available activities as well as a button that I can press called "Create an activity" and it will allow me to add a new activity. This screen should let you add a photo for the activity, the time it begins and ends, and the location to meet. After an event happens it is deleted from the place's page. Also, users can reserve a spot in other people's activities. Users can also choose to make an activity private and only people who are invited can join that. There will also be a calendar view of all activities occurring in that place. As the moderator, I should be able to add new places and delete activities if they are inappropriate from the backend. If possible, I would also like there to be a feature to add other users as a friend and share activities you completed on facebook or twitter.