1) June 30
2) July 1
3) July 2
4) June 2
Explanation:
On July 2, 2019, World UFO (Unidentified Flying Objects) day was observed all over the world. It is celebrated to increase awareness among people about the existence of UFO. The first World UFO Day was celebrated in 2001.Earlier, the day was celebrated on June 24, the date on which aviator Kenneth Arnold reported seeing nine unusual objects flying over the state of Washington but WUFODO (World UFO day Organization) declared July 2 as the world UFO day to celebrate it on a larger scale.