Black helicopter and the Olympic alien invasion

http://articles.latimes.com/2009/aug/12/sports/sp-wolper-olympics12

Link above is the story of how they got the spaceship to fly at the 1984 Olympics. 

There are some keywords in the article though; see how many you can find.

Battle for London

From The Battle of Los Angeles film

Which was based on a real event:

http://en.wikipedia.org/wiki/Battle_of_los_angeles

In 1984 (84/48), Los Angeles held the Summer Olympics; the last of the closing ceremonies included a UFO and an "E.T.":