I’m a tad backlogged on my Non-Prophets and Godless.biz podcasts. As such I have only just now gotten to Non-Prophets 10.2. In it there was a discussion about secular rituals. Specifically about replacing religious ones and the difficulties of doing so without a central authority. Now, ignoring the plethora of national holidays and the rituals they present (fireworks on the 4th, nuff said) I could think of one secular ritual in which I participate. A ritual I am willing to bet a good portion of Atheists in America participate.
I’ve thrown several and have attended several. Nary a religious notion in site. Just groups of people gathering to celebrate obtaining a home and/or welcoming a new neighbor to the area.