Honkai: Star Rail Planar Fissure Event - Honkai: Star Rail Guide - IGN
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Two Planar Ornaments are always better than one, right? While the Honkai: Star Rail Planar Fissure Event is active, you'll receive double the amount of

The Planar Fissure event is now live. Get double the planar rewards today through June 28 @ 4 AM (server time). I’m fairly sure I read that there are limits to how many double rewards you can collect per day, but this article didn’t mention that.

Edit: You can only claim 2 “double” rewards per day.