Choto (?) already made a hack to make it go back to worldmap, it's on the forum somewhere. BTW, none of this is event stuff... This is worldmap/attack.out stuff.
The stone requirement is just a variable check in the conditions on Warjilis. You can learn this yourself on the Wiki. No reason for someone else to do something so small. It's just a variable edit based on the variables on the wiki, change the check for Warjilis to play the bar scene to include the variable for the Virgo stone.
^^ I explain how to do this in my "How to make a story mod" tutorial.