Desktop settings:
So here is how you activate the Mobile app: you enter your data here (username and password) and then pick a person who you want to edit the app with you and give them your username and password. With username and password of their own they'll be able only to read the Guest lists of an event that has tickets and scan the tickets QR.
Then you add the Calendar app to your phone. No one else would be in charge of your editing.
Mobile settings:
So here is how it looks like when it's in your hands. 
From the hamburger menu, you choose the page which Calendar you want to edit, on this page you also can choose the language which is convenient for you. After choosing the Calendar, you appear on this page where you can add and edit your events.
And here is the main page where you add and edit your events how it is supposed to be!
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