Tertullian Day is held on April 26. Was a prolific early Christian author from Carthage in the Roman province of Africa. Of Berber origin he was the first Christian author to produce an extensive corpus of Latin Christian literature. Tertullian has been called "the father of Latin Christianity" and "the founder of Western theology.". This event in the third decade of the month april is annual.
Töchter-Tag or Daughter's Day in Hamburg, Germany on April 26 (The Youth Education Association became the initiator in Hamburg. The idea is to introduce girls to technical professions);
Mother’s Day on May 9 (Anguilla, Antigua and Barbuda, Aruba, Australia, Austria, Bahamas, Bangladesh, Barbados, Belgium, Belize, Bermuda, Bhutan, Bonaire, Botswana, Brazil, Brunei, Canada, Cambodia, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Congo, Dem. Rep., Congo, Rep., Cote d'Ivoire, Croatia, Cuba, Curaçao, Cyprus, Czech Republic, Denmark, Dominica, Ecuador, Equatorial Guinea, Estonia, Ethiopia, Faroe Islands, Fiji, Finland, Germany, Gabon, Gambia, Greenland, Ghana, Greece, Grenada, Guyana, Honduras, Hong Kong, Iceland, India, Italy, Jamaica, Japan, Kenya, Latvia, Liberia, Liechtenstein, Macau, Malaysia, Malta, Myanmar, Namibia, Netherlands, New Zealand, Pakistan, Papua New Guinea, Peru, Philippines, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Singapore, Sint Maarten, Slovakia, South Africa, Sri Lanka, Suriname, Switzerland, Taiwan, Tanzania, Tonga, Trinidad and Tobago, Turkey, Uganda, Ukraine, United States, Uruguay, Vietnam, Venezuela, Zambia, Zimbabwe);
Europe Day on May 9 (is the name of two annual observance days, 5 May by the Council of Europe and 9 May by the European Union, which recognize the peace and prosperity within Europe that both have achieved since their formation);
Father's Day in Germany on May 13 (Vatertag is always celebrated on Ascension Day);
Japan Day in Düsseldorf on May 29 (date for 2021. Celebrated on the last Saturday of May)