Hi Jon and welcome to the forums!
Good question. Looks like that example is using Photo View, which is an option in the Events > Settings > Display screen. You can change your default view to Photo View and it will align the events in three columns just like that.
The example also looks like it did a bit of customization to make the columns equal heigh like that. I did come across a tutorial by another customer who outlined how she was able to do just that. That would accomplish the same thing as the Milkwood example.
Cheers!
Geoff