Hi Melle,
Thanks for the interest in our plugins.
I can help you out.
There are a couple different ways we provide to display Events by Category.
By default all the views (month, list, photo, etc) have Category Pages so in this case the Concert Category and the Meetup Category Events would have these urls to only show events from those categories:
/events/category/concert/
/events/category/meetup/
You are not able though to take those views and embed them on a specific page with a shortcode.
Widgets
Both our Mini Calendar and List Widget enable you to filter by category too. It would be up to you though to show those widgets on a specific page.
Does that answer your questions?