I'm planning to do
Apart from sleep, which I think most people would agree is pretty much a given [like, get as much as you can] I'd say be prepared to change plans on account of listening to body and mind. See how it goes. We're all different [and we're all the same!] and what goes for one is not the right path for another. You'll know what you'll want to be doing nearer the time. Be honest about it. There are no prizes for doing long rides nearer the event just because you 'think' it might stand you you in good stead. Conversely, you might be in the zone and think 'what the hell'.
Play it by ear, I'd say. And your body we be telling you regardless. Don't ignore it.
Me, I tend to taper down about 3 months before something like this, but that's mainly because of other distractions! Then I crawl round the event howling like a wounded animal, saying 'never again, it's all insane, next time I'm going to prepare properly....blah, blah!'
Yeah, right.