I need to show all the categories on the main spider wordpress calendar. If I am using categories then only one category at a time shows on the calendar. When the calendar opens it needs to show all active dates no matter which category. Then if the user wishes they can filter by specific category. This is very important for what I am working on and I hope it is possible. I've paid for the plugin and like it otherwise!

Dear customer,

Yes, it is possible. You should create your events and set categories for them. Afterwards, you should add the events to your calendar.