The UU Humanist Association is a member organization of the Secular Coalition for America. Here is their description of the event:

Become a political insider at the national conference that brings secular voices to Congress. Don’t miss the chance to receive hands-on lobby training from the experts to become a more effective advocate for secular values and to meet your members of Congress and their staff on Capitol Hill. In-person lobbying from constituents is still the most effective method for influencing elected officials. Now, more than ever, lawmakers need to hear from their secular constituents. The night preceding Lobby Day, on the evening of June 14, 2017, the Secular Coalition will host its Secular Awards Dinner.