Where or when to join the modifying clause?

Question

Source :in the minddle paragraph

I had the pleasure of running into John Paulson this past week where I got to introduce myself in passing.

This past week is a time ,not a place.

When is a time-relative pronoun that joins a modifying clause.
Where is a location-relative pronoun that joins a modifying clause.
For example:
The day when the concert takes place is Sunday.
The site where the concert will take place is Golden Gate Park.

Maybe the sentence :

I had the pleasure of running into John Paulson this past week when I got to introduce myself in passing.

It is a typo in the article ?

Answer 1

I wouldn't call it entirely wrong, but I like when better than where here. The reason that it isn't entirely wrong is that presumably there was a place where the speaker ran into Paulson.

Suppose we add this:

I had the pleasure of running into John Paulson this past week at the convention, where/when I got to introduce myself in passing.

As you can see, this sentence provides both a time and a place, and where or when work equally well.

Answer 2

In this sentence, where is a conjunction. According to the Cambridge Dictionary, as a conjunction, it can either mean in a place that, or in a situation that.

In your sentence, no place is referred to, but meeting John Paulson is a situation, and in that situation the speaker was able to introduce himself.

This meaning is used a lot in mathematics, for example:

Transformations on rational functions where x is in the numerator and denominator