They're doing the Prime Day Bust again this year, per email I received today:
Make sure you’re ready for Prime Day!
Hello from Fulfillment by Amazon,
Prime Day, our global shopping event for Prime members, is coming mid-July! Last year, Prime customers ordered over 34.4 million items worldwide, saving millions of dollars in the process. Make sure you’re prepared to take advantage of this opportunity!
Start preparing for Prime Day today!
Thank you for selling on Amazon.
Sincerely,
The Fulfillment by Amazon Team