Event Scripting is a confusing term in relation with RPG Maker XP/VX.
It is not uncommon to have a scripting system on which you can create events for the player. You could have programmers working on the back-end or something else in C++ or something and event scripters making events with a scripting language. In this case The term makes perfect sense.

It could also have another meaning in scripting out events. More of a storyboard role. You could also understand it in that way.

I agree with Regi and Jaide. In fact, that's how I also saw "event-scripting" as. Making use of your scripting abilities through call script event commands, really. Lately, I've been trying really hard to make good use of scripts in event systems in some attempt to push us eventers forward. XD