Is there an explanation for concepts or situations that are repeated within a short amount of time?
Short answer
The repeated encounter of a word or object after just having been introduced to it is linked to the frequency illusion, also called the Baader-Meinhof phenomenon.

Background
It may be an example of the frequency illusion:


  The illusion in which a word, a name, or other thing that has recently come to one's attention suddenly seems to appear with improbable frequency shortly afterward


It's also referred to as the Baader-Meinhof phenomenon, colloquially described as


  [T]he phenomenon where one stumbles upon some obscure piece of information—often an unfamiliar word or name—and soon afterwards encounters the same subject again, often repeatedly.


It's also related to things like buying a brand new car that was just newly released and suddenly it pops up all around the neighborhood.  

The Frequency Illusion is thought to be the result of two psychological processes:  selective attention (noticing things that are salient to us, disregarding the rest) (Yantis, 2008), and confirmation bias (looking for evidence that supports a hypothesis and disregarding counterevidence). source: Stanford University  

Reference
- Yantis, Curr Dir Psychol Sci (2008); 17(2): 86–90