(Occurrence Dates) - Country
Second Sunday of February
(February 8 2009) (February 14 2010) - Norway
(February 2) - Greece
(Shevat 30) - Israel
(Falls anywhere between January 30 and March 1)
(March 3) - Georgia
(March 8) - Afghanistan, Albania, Armenia, Azerbaijan, Belarus, Bosnia and Herzegovina, Bulgaria, Laos, Macedonia, Moldova, Montenegro, Romania, Russia Serbia, Ukraine
Fourth Sunday in Lent
(March 22 2009) (March 14 2010) Ireland, Nigeria, United Kingdom
(March 21) (vernal Equinox) - Bahrain, Egypt, Iraq, Jordan, Kuwait, Libya, Lebanon Oman, Palestinian Territories, Saudi Arabia, Sudan, Syria, United Arab Emirates, Yemen
(All Arab countries in general)
(March 25) - Slovenia
(April 7) - Armenia
Baisakh Amavasya (Mata Tirtha Aunsi) - Nepal
First Sunday of May
(May 3, 2009)(May 2, 2010) - Hungary, Lithuania, Portugal, Spain
(May 8) - Albania (Parents' Day), South Korea (Parents' Day)
(May 10) - El Salvador, Guatemala, Mexico
Second Sunday of May
(May 10 2009) (May 9 2010) - Anguilla, Aruba, Australia, Austria, Bahamas, Bangladesh, Barbados, Belgium, Belize, Bermuda, Bonaire, Brazil, Brunei, Bulgaria, Canada, Chile, Colombia, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Ecuador, Estonia, Finland, Germany, Ghana, Greece, Grenada, Honduras, Iceland, India, Italy, Jamaica, Japan, Latvia, Malta, Malaysia, Myanmar, The Netherlands, New Zealand, Pakistan, Papua New Guinea, Peru, People's Republic of China, Philippines, Puerto Rico, Republic of China (Taiwan), Slovakia,
South Africa, Sri Lanka, St. Lucia, Saint Vincent and the Grenadines, Sint Maarten, Singapore, Suriname, Switzerland, Trinidad and Tobago, Turkey, Ukraine, United States, Uruguay, Venezuela, Zimbabwe
(May 15) - Paraguay
(May 26) - Poland "Dzień Matki"
(May 27) - Bolivia
Last Sunday of May
(May 31 2009)(May 30 2010) - Algeria, Dominican Republic, France (First Sunday of June if Pentecost occurs on this day) French Antilles (First Sunday of June if Pentecost occurs on this day) Haiti, Mauritius, Morocco, Sweden, Tunisia
(May 30) - Nicaragua
(June 1) - Mongolia (The Mothers and Children's Day.)
Second Sunday of June
(June 14 2009)(June 13 2010) - Luxembourg
Last Sunday of June
(June 28 2009)(June 27 2010) - Kenya
(August 12) - Thailand (the birthday of Queen Sirikit)
(August 15) (Assumption Day) - Antwerp (Belgium), Costa Rica
Second Monday of October
(October 12 2009)(October 11 2010) - Malawi
(October 14) - Belarus
Third Sunday of October
(October 18 2009)(October 17 2010) - Argentina (DÃa de la Madre)
Last Sunday of November
(November 29 2009)(November 28 2010) - Russia
(December 8) - Panama
(December 22) - Indonesia
A source of useful information :-) In case you ever need to 'phone a friend'!!!