The RCA convention is a large, complex event managed by our staff. We work closely with vendors to keep convention costs to chaverim low. As with all catered events, our caterer requires a final number prior to the event in order to purchase the correct amount of food and other supplies in order to prepare meals for the anticipated number of attendees. Additionally our staff needs time to prepare customized material for each individual attendee in an organized fashion, and for the correct number of attendees. This, too, keeps costs low. Therefore, registration is not available after May 20th.