The category of transition words that demonstrates when or where something occurred is "time/location". To identify this category, you can look for words or phrases that indicate a specific time or place in the sentence or passage. Examples of time/location transition words include "after", "before", "during", "next", "where", "there", "here", etc. These words help the reader understand the sequence of events or the spatial relationship between different points in the text.
The category of transition words that demonstrates when or where something occurred is "time/location".