From now until March 11.
Destiny Child is everyone’s favorite mobile waifu collection game and voted most likely to elicit an “I didn’t know Beyonce was involved in video games” response from my roommate four years running. This week Destiny Child adds in a narrative dungeon open only until March 11 maintenance. Players can take on the dungeon to obtain a five star Cute Euros. How cute? Just look at the header.
Collect in-game dice to redeem for summon tickets and perform 10 free child summons once a day for the duration of the event.

And more importantly, collect more waifus. Destiny Child available on iOS and Android.
Source: Press release