If there is a way to display the required level or name above each location, that would be awesome. That was a popular Yanfly plugin in RPG MV but don't think it exists in SGB. There was a way for squeeze by the forest to the east and enter the incomplete town. If not intentional, simple invisible block or event should prevent players from accessing that area. Other than that, I`m a fan of pressing the action key on an event location rather than “If player touches” events for over world maps.