Explanation:

• The International Women’s Day (IWD) is celebrated on March 8 every year, to celebrate the social, economic, cultural, and political achievements of women.
• Official UN theme of IWD 2021 –  “Women in leadership: Achieving an equal future in a COVID-19 world”.
• IWD 2021 campaign theme: #ChooseToChallenge.
• A challenged world is an alert world. And from challenge comes change. So let's all #ChooseToChallenge.
• The hashtag will be #IWD2021 and #InternationalWomensDay.