The 2011 Egyptian Protests

Until 30 January, the British government was advising its citizens to stay put (although advising against non-essential travel). However, it was then revised to say "We recommend that British nationals without a pressing need to be in Cairo, Alexandria or Suez leave by commercial means, where it is safe to do so." The Foreign Ministry recommendation that citizens in other parts of the country not affected by widespread protests and violence stay where they are and to stay indoors.
The US advised its citizens to take evacuation flights to safe havens in Europe. It later warned its citizens to leave "as soon as possible". It also offered to send a plane to evacuate embassy personnel to reduce its "diplomatic footprint" in the country.
South Korea's flag carrier Korean Air suspended flights to Egypt on January 30. The Foreign Ministry also suspended classes at the Korean School which had an attendance of some 40 elementary school students. The South Korean embassy was putting together an emergency plan to evacuate Korean nationals in the event of a serious crisis.
Multinational corporations also said they would evacuate their employees.