During the event, complete all the conditions for "The Moon's Comely Brow" to obtain Ningguang's outfit "Orchid's Evening Gown."
Complete four themed challenge quests to obtain other rewards.
View details here:
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https://genshin.mihoyo.com/en/news/detail/18164

https://twitter.com/GenshinImpact/status/1476765057040146432