Hi,
Thanks for the interest in our plugins.
I can help out here.
I took a look at that site and they are using the Events Calendar and I see the events tab.
Unfortunately, that is not a feature of ours. It maybe possible with another widget that creates tabbed content using different widgets or by shortcodes and you could use out Event List Widget For that.
I do not know any off the top of my head, but WordPress.org might have some plugins in there to do that.
Let me know if you have any follow up questions.
Thanks