Displaying a slideshow of an Event Gallery in Curator is very simple. 

Step 1: Connect any PC or Laptop to the screen you intend on using for your slideshow

Step 2: Log into your Curator account on the PC or Laptop connected to the screen

Step 3: Browse to your event and click on 'View' per the screen shot below

Step 4: Click on 'Play Slideshow'

Step 5: A new browser tab will open, displaying the slide show. Drag this tab over to your external monitor, then press 'F11' key on your keyboard to make the slideshow full screen.