The parseevars is in the wrong place in DeV's example. :P

pl0OnEnter !ParseEvars !Execute [!LabelShow pl1][!LabelRepositionBy %[LabelName]% -4 -4 8 8]

Try that.

edit - Boreas' example should work just fine, too. (Mine would parse multiple %[...]% through out the line, his just for the command enclosed within the [] with it.)