I am pretty sure this is a mistake. I've done almost every cycling challenge since 2015, and I've never seen an official monthly challenge start at any other date than the first of the month.
Solved
Why does the April Ride 600K Challenge start on 4/2?

Best answer by Scout
Hey @shaunivory & @Cushman,
Thanks for your posts!
This was an error and our team has updated the start date for this challenge to April 1.
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