Yep, don't neglect poor Luxembourg. While we're racking up numbers, I'm not sure why you're skipping Andorra while in the neighborhood. I assume you're including Monaco, since it's right on your route, and Gibraltar looks certain (if you're calling it a country), but you seem to be discounting Liechtenstein, San Marino and the Vatican. And as long as you're whipping madly through the Baltics, what about a quick detour to Kalingrad, which ticks Russia off the list? While you're at it: maybe Moldova? A scenic nip through the mountains in western Ukraine? I can't tell on your map whether you've included Kosovo, but it'd be a shame to miss out.
Ok, so you're aware we all think your concept is less-than-optimal. The problem is that your questions about sights to see and places to stay--much less meet-ups and ride-outs--doesn't make much sense in the context of your 50-day trip. You'll have time for a couple of quick scenic breaks and maybe a  here or there, but basically you're going to have to dedicate yourself to continuous movement at the expense of anything else. When you do stop, you're always going to be aware of how much further you need to ride to compensate. And as the previous poster says, you'll try to be satisfied with occasional glimpses of interesting places while buzzing by at a high rate of speed on the motorway.
I've been to most of the places on your map, although not quite all. If you can take 50 days away, is there any chance that a hundred is possible? If not, maybe think about the fact that you've lots more birthdays coming up. Based on my own direct experience, 50's not really so special. Save something for 51-9, and then some more for 60+.
Hope that's helpful.
Mark
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