An oxymoron since, as the sole defining characteristic of an atheist is a lack of belief in god, an atheist holiday would be a celebration of nothing.
A better alternative is a Day of Reason or holiday in celebration of science such as Darwin Day.
An atheist holiday is as absurd as a christian scientist.
1st day of April, All Fools Day
Hooray For That Judge In Florida, an atheist became incensed over the preparation for Easter and Passover holidays and decided to contact the local ACLU about the discrimination inflicted on atheists by the constantmore...
celebrations afforded to Christians and Jews with all their holidays while the atheists had no holiday to celebrate.
The ACLU jumped on the opportunity to once again pick up the cause of the godless and assigned their sharpest attorneys to the case.
The case was brought before a wise judge who after listening to the long, passionate presentation of the ACLU lawyers, promptly banged his gavel and declared, "Case dismissed!"
The lead ACLU lawyer immediately stood and objected to the ruling and said, "Your honor, how can you possibly dismiss this case? Surely the Christians have Christmas, Easter and many other observances. And the Jews--why in addition to Passover they have Yom Kippur and Hanukkah...
and yet my client and all other atheists have no such holiday!"
The judge leaned forward in his chair and simply said "Obviously your client is too confused to know about or for that matter even celebrate the atheist holiday!"
The ACLU lawyer pompously said "We are aware of no such holiday for atheists, just when might that be, your honor?"
The judge said, "Well it comes every year on exactly the same date---April 1st!"
"The fool says in his heart, 'There is no God.'" - Psalm 14:1, Psalm 53:1
HOORAY FOR THAT JUDGE