Decide who can have access to your event in the Meeting Application System. It’s up to you whether users should log in when entering the Mobile App and Landing Page, or have open access to the content.
If you want to protect the event from unwanted guests, you can optionally create an additional access code for the event, or limit access to a completely closed guest list using the Whitelist feature. By using these methods, the content in the App will be 100% confidential.
In the second step of creating an event in the Admin Panel, in the Access section, you have to choose one of four access types for users (you can change it later):

ATTENTION! Depending on the selected type of access to the event, the level of difficulty of joining the app or the website will require different actions. Make sure that event participants know what they have to do, what actions to take to join or display tickets on the Landing Page; by adding instructions in welcome emails. You can learn more about system emails from 
THIS ARTICLE.
This is a type of access where the organizer defines a list of specific event attendees. Only people whose email address has been added to the MA System in the Admin Panel in the Manage tab, in the Users module, can join the event. You can learn how to import users from the article User Import. In addition, you can specify an entire email domain whose members will be granted access. If a user outside the Imported List wants to join the event, they appear on the attendee list with the status Pending. The MA System Administrator must approve this person in the Admin Panel in the Manage tab, in the Users module before they gain access to the event content.
This switch controls the visibility of the “Buy ticket“ button when entering the event from the Dashboard; switch off:

switch on:

This switch will force Participants to log in to the event in the Mobile App and on the Landing Page.
The MA system requires every user to log in. Logging into the Mobile App is possible using a Meeting Application account. If you don’t have an account, you can go to user registration, located at the very bottom of the screen.
Modules that require logging in are: Feedwall, Attendees, Treasure Hunt, Business Matching, Lead Scan
If you want to protect the event from guests outside your organization, you can set an extra access code that the MA system will ask for when someone tries to join the event. This feature is completely independent of the type of access you choose, so you can apply it to any of them:

The access code should consist of a sequence of characters or digits and cannot contain spaces or diacritical marks.
Remember to share the Access Code with the target users before they start joining the event!
Attention! When the event is not published yet, a maximum of 5 users can access it. Even if access to the event is set to Disabled, people joining the event demo have to be logged in so that they show up on the USERS list in the MANAGE tab.
The event administrator will be able to join the demo even if there are already 5 users on the list. If the administrator is one of the 5 people visible on the user list in the demo, no additional people will be able to join.
Have a great event with Meeting Application!