[2021] they did not even tell us this!

They did specify it will happen over 7 days: "As a thank-you for celebrating with us by playing Dead by Daylight, over the first 7 days[/b[ of the event we’ll be giving away a total of 9,000 Iridescent Shards per player just for logging in"
This means they'll be given over the course of 7 days, not at once. You can read the full thing here: https://deadbydaylight.com/en/news/5th-anniversary-limited-time-event