An event is a single point in time. Context is everything around it that explains why it happened, what led up to it, and what it is likely to mean going forward. A report that gives only the event leaves a reader technically informed but often no wiser about what to make of it.
Good context journalism answers the quiet questions a headline leaves hanging: has this happened before, what changed this time, and who is affected in ways the immediate story does not mention. Those questions take more space and more effort to answer, which is part of why they are so often skipped.
Reading for context is a habit a reader can build even when the reporting does not supply it: pausing after a story to ask what history or background would help explain it, then, when time allows, actually going looking for that background before forming a firm opinion.