The first Reason Rally was a public gathering for secularism and religious skepticism held on the National Mall in Washington, D.C. on March 24, 2012. The rally was sponsored by major atheistic and secular organizations of the United States and was regarded as a "Woodstock for atheists and skeptics". A second Reason Rally was held on June 4, 2016 at the Lincoln Memorial in Washington, D.C..
Speakers and performers at the first rally included biologist Richard Dawkins, physicist Lawrence M. Krauss, musician Tim Minchin, MythBusters co-host Adam Savage, actor-comedian Eddie Izzard, Paul Provenza, PZ Myers, Jessica Ahlquist, Dan Barker, and magician James Randi, among others. The punk rock band Bad Religion performed and other notables (Rep. Pete Stark, Sen. Tom Harkin, comedian Bill Maher, magician Penn Jillette) addressed the crowd by video link. Participants recited the Pledge of Allegiance, deliberately omitting the phrase "under God", which was added by the U.S. Congress in 1954. Veterans of the U.S. Armed Forces were represented, and a retired Army colonel, Kirk Lamb, led veterans in an affirmation of their secular military oaths. Speakers urged those assembled to contact local and national representatives and ask them to support church-state separation, science education, marriage equality for gays and lesbians, and ending government support of faith-based organizations, among other causes.
According to the official website of the first rally, the aim of the Reason Rally was to "unify, energize, and embolden secular people nationwide, while dispelling the negative opinions held by so much of American society." The website had predicted it would be "the largest secular event in world history." The Atlantic said 20,000 people were in attendance. Religion News Service said 8,000–10,000. The documentary The Unbelievers says that over 30,000 people attended the rally. There are no official crowd estimates of events on the Mall.
The second rally, the Reason Rally for 2016, was billed as "a celebration of fact-driven public policy, the value of critical thinking, and the voting power of secular Americans". The weekend of the Rally included advocacy events and conference sessions.
According to the first rally's official website, the event had three main goals:
David Silverman was the creator and executive producer of the event, and the president of the Reason Rally Coalition. Organizers said the aim of the rally was twofold: to unite individuals with similar beliefs and to show the American public that the number of people who don’t believe in God is large and growing. “We have the numbers to be taken seriously,” said Paul Fidalgo, spokesman for the Center for Inquiry, which promotes the scientific method and reasoning and was one of the organizations sponsoring the rally. “We’re not just a tiny fringe group.”
According to rally spokesman Jesse Galef, diversity with the attendees was a focus this year, he stated 'We can't succeed if we are only coming from one demographic'". Comparing the 2012 rally to the 2002 Godless rally which was mainly over-40 white men, the attendees were "largely under the age of 30, at least half female and included many people of color".
Speaking to NPR prior to the rally, American Atheist president David Silverman stated that this is a coming-of-age event for atheists, "We'll look back at the Reason Rally as one of the game-changing events when people started to look at atheism and look at atheists in a different light".
With goals of bringing unity, energy, and visibility to the secular demographic, the rally can be seen as a manifestation of the secular movement that emerged in America and elsewhere in the first decade of the twenty-first century. Writing for The Guardian Sarah Posner states that the Reason Rally was modeled on the LGBT movement, encouraging people to 'come out' about their non-belief and working to humanize atheism by getting "people to personalize someone they'd always thought of as an 'other.'" Once people realize that their neighbor, co-worker or family member is an atheist it goes a long way towards acceptance. Politics played a large part of the Rally according to Posner; considering that there is only one openly atheist American Congressperson, there is a lot of work to still be done.
In the Huffington Post, Staks Rosch praised the rally. He stated that atheists "face a great deal of discrimination and fear of discrimination for being outspoken" and that many "fear having their families disown them, losing their jobs, or simply being harassed by the religious."
David Niose, the president of the American Humanist Association stated that "The secular demographic does not claim to have a monopoly on rationality, but it does feel that it has something to offer. By rallying in Washington, seculars are not whining about some imagined victimization, but rather they are exercising a voice that has been silenced for too long."
Nate Phelps, an atheist and estranged son of Fred Phelps, the founder of the fringe group, Westboro Baptist Church, supported the Reason Rally and was among the event's speakers.
The Reason Rally elicited criticism for the antitheist rhetoric and tone that some speakers employed, since its purpose is to reject religion and superstitions, in favor of employing reason and promoting a secular lifestyle. Editorial writers such as Nathalie Rothschild and Tom Gilson,  and representatives of various religious communities, such as Rabbi Brad Hirschfield of the National Jewish Center for Learning and Leadership and William Anthony Donohue of the Catholic League, all voiced disapproval.
The second quadrennial Reason Rally was held on June 4, 2016 at the Lincoln Memorial in Washington, D.C..
The Reason Rally for 2016 was billed as "a celebration of fact-driven public policy, the value of critical thinking, and the voting power of secular Americans". The weekend of the Rally included advocacy events and conference sessions.
Event organizers were targeting an attendance of 30,000, but crowds proved much smaller; sources disagree on the exact attendance..
One of the featured speakers at the rally was John de Lancie. Speaking in reference to his Star Trek character Q, de Lancie said:
My name is John de Lancie, and I am a god. At least, I've played one on TV. And I'm here to tell you as a god that I was created by humans. And the words I spoke were written by men and women ... My creators took great care in exalting me to the position I hold today. And just like all the gods before me—Zeus, Baal, Yahweh—my god creators wanted you to believe that I am the omnipotent one. The alpha and the omega… Truth be told… I don't exist any more than the thousands of other gods that humans have created, worshiped, and died for since the beginning of time. But if you insist on believing in me, you do so at your own risk… I will lead you down the path of ignorance, intolerance, and bigotry… All because you believe.