Where can I find OnWaveSpawned(Brewery5) in blueprint?

Looking at the Strategy Game Example I was looking into how each node in the graph was created. I noticed I couldn’t create the OnWaveSpawned(Brewery5) node to hook up to the multiple SpawnNormalMacro nodes.

Right Clicking and Searching for OnWaveSpawned just allows me to view it and not add it.

Duplicating the existing OnWaveSpawned nodes create duplicate CustomEvent Nodes which has different properties to the OnWaveSpawned node which has no additional information in it. How can I place this in the Blueprint to hook it up and where I can view what this event does?