Hello Lucas,

Thank you for reaching out to us.

When you have several questions or issues please open a new ticket, and we will help you there. In that way, issues and questions which are related to different subjects will be in separate tickets so other customers or our support agents can find them easily. 

Our policy is to have one issue or question per ticket because of the reasons that are described already.

Thank you for understanding.

• All of a sudden no events are showing in the backend anymore even though they show on the front-end calendar. (I tried disabling the plugins to see if there was a conflict with any of them but nothing happened, also by changing the dates filter on the top left corner but same thing, nothing shows up). - Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 
  We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties.  You can write credentials here just check PRIVATE Reply so nobody can see them except us.
• How can I remove the FREE button and or payment on an event type? - You can not remove this button but you can change the label like this

• Is it possible to show the weekly view in the calendar view and not the list view on the front end? - I'm afraid that we didn't quite get what you want to achieve exactly? Can you explain to us in a little more detail, and send us a couple of screenshots? 
• How can I manually add in attendees so that a recurring event is full? - When you click on events you will attendee option. When you click on that you can add attendees to that events.

Looking forward to your reply.