Custom mobile application for events

We are looking for developers who can build native application for us which should be easily editable and can be re-skinned in future. Application can be native app on Ionic, phonegap or standalone IOS application. Features will be > Instagram API integration to show media according to tags, user search, likes, comments, post images to instagram from our application. > Static information screens to display events with date, time and venue > In app messaging within registered users of the application. > Flow for user registration will be based on event id's we will generate a backend. For example we have created an event from backend say EXPO IN NY with event id EXPNY01. Then any user coming on the app will have to provide event id along with his/her personal details to register. Then the user will get information related to that particular event and can chat with other user with same event id. > Backend should have ability to store Insta hashtag for specific events. Creation of event information page. > Push notification with image support. > Panel to create notification from the backend based on event id. We are restrictive on timeline so we need this application within 20 days of first milestone. Only people with references should bid on this project.