Sisters Day
Sisters Day is held on August 4. Celebrated on the first Sunday of August. This event in the first decade of the month August is annual. 
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A sister is someone who loves you from the heart. No matter how much you argue, you cannot be drawn apart. She is a joy that cannot be taken away. Sisters Day was initiated by social media users in 2012. A recent study by psychologists Liz Wright and Tony Cassidy found that having a sister makes you happier and more optimistic, but the same is not true for having a brother. A study from Brigham Young University found that people with sisters experience less guilt, loneliness, and feelings of fear overall than people without sisters.
Sisters, either older or younger, are a major factor in siblings having more positive emotions.
Similar holidays and events, festivals and interesting facts
World Watermelon Day on August 3
National Clown Day in USA on August 3 (Saturday of Clown Week);
Clown Day in Netherlands on August 3 (In Netherlands, they call it Internationale clown dag);
Clown Day in Italy on August 3 (In Italy, they call it Internazionale pagliaccio giorni);
Clown Day in Norway on August 3 (In Norway, they call it Internasjonal klovn dag);
Matica slovenská Day in Slovakia on August 4
International Forgiveness Day on August 4
Bridge and Chopsticks Day in Japan on August 4 (Hashi No Hi);
Underwear Day on August 5
Fresh Breath Day on August 5
Work Like a Dog Day on August 5