I imagine that one needs a congressperson to help arrange such a thing, but none is mentioned on their site.
They hope to attract members of Congress to their anti-Israel propaganda.
I am very interested in finding out how one goes about getting a room in a congressional building.
They have every right to meet wherever they find a venue. But whoever attends must know that they are lying, such as when they say that boycotting Israel is constitutionally protected.