Some countries observe November eleventh as Armistice Day or Remembrance Day.

VOA: special.2009.11.14

I do therefore invite my fellow-citizens in every part of the United States, and also those who are at sea and those who are sojourning in foreign lands, to set apart and observe the last Thursday of November next as a day of thanksgiving and praise to our beneficent Father who dwelleth in the heavens.

VOA: special.2009.11.23

Security was already tight as Iranians observe an annual period of mourning.

VOA: standard.2009.12.22

But they did not take part in the recount because the court refused to allow each of them to send a political representative as well as a bailiff to observe the process.

VOA: standard.2009.10.04

As Somalis prepare to observe the start of the Muslim holy month of Ramadan, al-Shabab and Hisbul Islam rebels appeared to have made good on their vow to mark the start of Ramadan with intensified attacks against the government and the African Union mission in Mogadishu known as AMISOM.

VOA: standard.2009.08.21