Still having some trouble with it. Here's what my set up looks like.
Created a Game Event called "gateUp" and first set up the "Event Actors"

Next I added a Transform to Variable node

Then I added a Change Game Variables node

And finally a Change Position node

Then, in my scene I created an empty GameObject called "GateTriggers" attached to my "wall" that was housing my gate, with a Box collider much larger than the gate. Here is the event set up.

Now when approaching the gate

And then when it actually triggers, the gate does this:

Sorry for the image spam, figured it was easier to see something if you could see it all lol.
Although now it seems like the gate has stopped moving entirely in my last test (So maybe I have done something completely wrong then?)