These are not the diplomatic events described by the article. Surrender events are dominated by military personnel and not diplomats from places other than the belligerent. In fact, there are separate diplomatic events related to each of your examples. The more relevant event for [3] took place at san francisco.

https://en.wikipedia.org/wiki/Treaty_of_San_Francisco

(You were probably biased by the appomatox court house surrender, which was an outlier in that article, which, presumably, the author had to include out of fervent provincialism)

That last one is not S. Vietnam surrendering, that's an American meeting Bui Tin, N. Vietnam Colonel, in 1973 as they implemented the Paris Peace Accord.

My understanding is there was no formal handover in 1975. In fact when the N. Vietnam knocked down the gate of the Presidential Palace and went inside, the S. Vietnam Prime Minister said he was handing over S. Vietnam and the response was "You have nothing left to handover at this point".

> Germany surrenders to France in a railroad car

And almost 22 years later, in the same carriage, parked in the same place, France surrendered to Germany [1].

[1] https://en.wikipedia.org/wiki/Armistice_of_22_June_1940

that's the next line in the comment you are replying to...

Huh, I'm not sure how I missed that...