Hi Nik. A component of Google's algo is Query Deserves Freshness and searcher side, people only looking for recent content, both of which could be at play when you're producing new content related to recent events. There's an older whiteboard Friday that discusses the general concept here: http://moz.com/blog/whiteboard-friday-query-deserves-freshness, and that still applies today.
An interesting examination of how QDF can affect rankings was done by Doctor Pete in a blog post from 2013 (as a portion of the rest of it here: http://moz.com/blog/whiteboard-friday-query-deserves-freshnesshttp://moz.com/blog/was-there-a-november-14th-google-update), but here are some of the main points quoted:
Google was viewing a search for "kaufman" as informational and generic, returning results for Andy Kaufman, Charlie Kaufman, cities named Kaufman, etc. A disambiguation box on the SERP even makes it clear that Google has trouble interpreting the query.
After the story about Andy Kaufman broke, the SERP changed dramatically:
Where there were no news-related organic results before, news articles now accounted for half of the top ten, including the #1 and #3 spots. You may have heard the term "QDF" (Query Deserve Freshness) in the SEO world. What's interesting here is that QDF is not something that's just on or off for any particular query. A query that was relatively static transformed overnight because of new information. In other words, Google decided in real-time that this informational query was now a news query, simply based on new data and content.
Regular blogging can trigger this, and several other factors. Cheers!