The second day of the Unknown Star event is on the break where the first stage involves gathering fallen meteorite pieces in exchange for the in-game currency which is tradable in the event shop.
Upon entering their vicinity their Vision will glow with a subtle purr once the player gets too close. They are dispersed in three separate locations with each fragment close to one another.
A Redditor by the name of Shukaaa pointed the locations for the fallen meteorite pieces in the map for us.
Qingyun Peak
Yaoguang Shoal
Cape Oath
The second part, namely Star of Deceitful Dreams, takes of tomorrow with new challenges and rewards to get excited about. The second part is likely to be in conjunction with part 1 whose completion will be necessary if need be.