How to create a team survey calendar app? [on hold]

I'm trying to create an Android application similar to the "Doodle Poll" app

https://play.google.com/store/apps/details?id=com.doodle.android

enter the description of the image here

Need to make a screen similar to this one. I am looking for a lot for the demonstration project or example. Do not get anything. Sorry, I do not know if it's the right place to ask such a question. Guys, help me please