Hi Marie!
I’m sorry to hear that you’re having issues with the categories displaying. I will try to help you get this working.
To display multiple categories using a shortcode, you would use “categories” instead of “category” like so:
[tribe_events categories="party, black-tie"]
Just separate the categories with commas.
As to your screenshot, I’m afraid this is not possible. Only one shortcode can be used on a given page, and they cannot be used on the page with the default calendar display.
Hope that helps! Let me know if you have any other questions.
Thanks,
Sky