I sleep in.
Unless I have something to do, then I do that.
However, I do occasionally attend "fellowship meetings" on any given day. Usually at night.
We call them "parties."
But seriously, atheists do often have social groups all over the country, usually meeting monthly, to talk and hear presentations, or drink or go bowling together, or whatever suits that group's interests the most. As an often scorned minority, atheists love to find like-minded people to hang around with. You can find us through atheists.meetup.com or through the Secular Web local groups list.