The Secular Coalition for America is sponsoring a Lobby Day this April. With the schedule the way it is, it almost seems like a full-fledged conference. The event takes place April 24th-26th, they’re expecting to be addressed by two sitting members of Congress as well as a White House official, and the panels are focused on issues we can actually change through legislation (e.g. Science education, religion and taxes, etc).
If you can make it, you should register now.