What you add into the plan as you get closer to your goal event depends on your event. For mountaineers and alpinists and ski mountaineers we up the ME work in the final weeks to months. And we make their ME work all about hiking steeply uphill with a heavy pack.
For runners and skimo we use the gym based ME and do so in the early base phase. In the late base we shift to more conventional interval training.
I hope this helps.