depends on when you want that scene to happen, and you need a combination of conditions/switches with multiple event pages and different triggers.
If you want the scene to happen upon entering a new map the commands are different than from being triggered by a quest or by a timer, so please tell us when you want the scene to show up.
That's probably the reason for your problems - each of the solutions you might have found in the forum depnds on the context of that game, and you'll need to find one example that is similiar to your situation, not just something for general use.