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What's amusing is that I've tried to do this nowadays, where I make plans with someone a few weeks in advance and then just show up. Only to have them not be there, and when I ask what happened, they said, "oh, I didn't think we were still doing that, you hadn't said anything about it in a while"
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It’s kind of funny that business etiquette has moved much more to scheduled meetings even for short discussions, and social life has moved in the opposite direction.
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At higher levels, I think impromptu calls/messages of a time-sensitive nature are probably more common. But, in general, phone calls out of the blue are less accepted than they were 10-20 years ago outside of a very close circle. And in business there would probably be a preceding message to the effect of “can we chat?”
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It depends. My friends with kids have everything planned out months in advance. If they're to come out to something they have to have it all scheduled between judo classes and school birthday parties blah blah

The rest of us just wing it. Which I really prefer. I hate having plans. Especially in case I might not feel like it on the night in question.

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Czechia has a very dense public transport network and if you want to walk a very nice network of marked tourist tracks. Not that different form 1989, except for marking an explicit cycling network since then.
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