1) 16th June
2) 18th June
3) 17th June
4) 15th June
Explanation:
On 18 June 2019, International Picnic Day was celebrated all over the world. It is a day to encourage people to go outdoors and enjoy each other’s company. International Picnic Day The word “picnic” originated from the French language. It relates to informal outdoor meal. Picnic became a popular time pass in France after the Revolution.According to the Guinness Book of World Records, the world’s largest picnic was held in Lisbon, Portugal.Charity events, school picnics and various types of group meals are held to commemorate this day.