Event scheduling IPhone/Android app

This is supposed to be a media app for the purpose of scheduling and organizing events. The app is going to be used to create an event, invite people to an event and share group messages. It uses phone contacts to achieve this. This interface will be extended to more specialized events later on. There is going to be a messenger embedded in the app, so if you have a readymade messenger template and UI/objects, that can speed up the process. The messenger and the app, in general, require the use of hardware features such as camera and GPS, similar to Facebook. If you have a Fb or WhatsApp messenger app template ready, that will also excellent. The app should also be able to send invitation SMS messages when not in internet connection, directly and globally. The app is expected to be deployed on the cloud. Familiarity with AWS/Heroku/Firebase or any other cloud server is necessary. Icon design and UI aesthetics also need to be worked out. Use of Adobe draw and knowledge of app aesthetics and UI flow would also come later on. Using good design patterns such as Immutable views pattern that reduces dependencies and facilitates better asynchronization is encouraged. Delevarables:- 1) Android app - Source code - Documentation 2) IOS app - Source code - Documentation 3)Interface with AWS/Heroku - Source code - Documentation 4) An App introduction website containing links to app.