Additionally, organizers are working with leaders of the African American community, representatives on Capitol Hill and other pro-marriage organizations to gain additional support.
Peters said that individuals and groups "from all over the country" have been pledging their support and attendance as well.
"It's really exciting to see that much interest before we've given people a plan to work with," he said.
Peters hopes that the march will help people stand up for the nature and meaning of marriage in the face of adversity.
"I think there's been a lot of effort in trying to silence people of faith from sharing their view on marriage, and that's a very disturbing trend," he explained. "I think that simply showing up and doing something in person really does help break that barrier for people."
While taking a stance for marriage may draw criticism, he acknowledged, such opposition "comes with the territory," and solidarity with other supporters can make it easier to publically defend one's beliefs.
Although the march is taking place on a serious day for those advocating for marriage in court, Peters said that the event is "going to be a joyful occasion."
He described the upcoming March for Marriage as a "celebration of the gift of marriage," focusing on the "celebration of life and of the next generation" found within the institution.