Explanation

• World Hydrography Day is observed on June 21 every year to raise awareness about hydrography and the essential role that it plays in improved knowledge of the seas and oceans.
• Theme 2021: One hundred years of international cooperation in hydrography
• Theme 2022: Hydrography - contributing to the United Nations Ocean Decade

Explanation

29 April is celebrated as International Dance Day under the initiative of Dance Committee of the International Theatre Institute, which is also the main performing arts partner of UNESCO. 

Explanation

World Blood Donor: 14 June annually 

Theme 2021: Give blood and keep the world beating

Explanation

Explanation

 International Day of Happiness is celebrated on 20 March. 

Theme 2021: Happiness For All, Forever

Theme 2022: Be calm, Be wise and Be Kind

Theme 2023: Be Mindful, Be Grateful, Be Kind 

Theme 2024: Reconnecting for Happiness: Building Resilient Communities

Theme 2025: Caring and Sharing

Explanation

World Rabies Day is observed on September 28 to raise awareness about the impact of the viral disease and how to prevent it.

Theme 2022: One Health, Zero Death

Theme 2023: Rabies: All for 1, One Health for All

Theme 2024: Breaking Rabies Boundaries

Explanation

World Social Work Day (WSWD) is observed on the third Tuesday of March every year.

It recognizes the contributions of social workers and promotes the importance of the social work profession globally.

Explanation

World Wetlands Day is celebrated on February 2 every year.

This day is an environmentally related celebration.

First celebrated on February 2, 1971.

Theme 2022: Wetlands Action for People and Nature

Theme 2023: It's Time for Wetlands Restoration

Theme 2024: Wetlands and Human Wellbeing
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Explanation

The year 2005 was named the World Year of Physics, also known as Einstein Year, in recognition of the 100th anniversary of Albert Einstein's "Miracle Year", in which he published four landmark papers, and the subsequent advances in the field of physics.

Albert Einstein was a German-born theoretical physicist, widely held to be one of the greatest and most influential scientists of all time.

Explanation

International Everest Day is annually celebrated on 29th May to commemorate the first-ever summit of Mount Everest by Sir Edmund Hillary of New Zealand and Tenzing Norgay Sherpa of Nepal on 29th May 1953.