Its currently not possible to use a category ID with the shortcode.
The function used for that shortcode is pluggable so with the help of a developer it would be possible to pass a category, pull the events from that category, loop over the ID’s add add them as if they had been set using the event_id parameter.
If you are not working with a developer currently you may want to try one of these:
The support post ‘Using Categories with Add to Cart shortcode?’ is closed to new replies.
Have a question about this support post? Create a new support post in our support forums and include a link to this existing support post so we can help you.