hi chalkgsy,
I been doing a lot of these VR event things lately here is how I handle it:
This is set in the level blueprint, at the start the players camera is faded in for a nice smooth introduction, then a delay of your choosing, then fade out. The fade out will stay like that until you hit the R key which will reload your map, this way when one person finishes the screen will be black for the next person, just hit R when the next person is setup. One extra bonus of doing it this way is that you can also fade the audio at the same time.