Explanation

Since 2006, the World Hypertension League has been dedicating May 17 of every year as World Hypertension Day.

Explanation

Saudi Arabia on 11 March 2023 marked Flag Day for the first time in its history with zeal.

Explanation

• October 31 was designated as World Cities Day by the United Nations in 2014.
• Theme 2020: Valuing our communities ad cities 
• Theme 2021:Adapting cities for climate resilience
• Theme 2022: Act local to go global
• Theme 2023: Financing Sustainable urban future for all 
  
  

Explanation

World Osteoporosis Day is observed annually on October 20th for raising global awareness and treatment of osteoporosis and metabolic bone disease.

Theme 2020: That`s Osteoporosis

Theme 2021: Take action for bone health

Theme 2022: Step up for bone Health

Explanation

World Sight Day, observed annually on the second Thursday of October, is a global event meant to draw attention on blindness and vision impairment.

Theme 2020: Hope in Sight

Theme 2021: Love Your Eyes 

Theme 2022: Love Your Eyes 

Explanation

World Maritime Day is celebrated on last Thursday of September. 

In 2022, it was celebrated on 29 September.

Theme 2022: New technologies for greener shipping.

Explanation

• Since 1980, the United Nations World Tourism Organization has celebrated World Tourism Day as international observances on September 27.
• Theme 2020: Tourism and rural development
• Theme 2021: Tourism for Inclusive Growth
• Theme 2022: Rethinking Tourism
• Theme 2023: Tourism and green investments
• Theme 2024: Tourism and Peace

Explanation

The International Day to Protect Education from Attack is an international observance established by a unanimous decision of the United Nations General Assembly in 2020, observed on September 9 of each year.

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

•  'World Water Week 2022' celebrated from  23 August to 1 September.
• Theme 2022: Seeing the Unseen: The Value of Water