Democratic presidential candidate Sen. Barack Obama will speak at a "Stand for Change" rally Sunday at the Virginia Beach Convention Center, his campaign announced today. Doors will open at 5:30 p.m., with the program to begin at 7:30 p.m. The event will be free and open to the public. The convention center is at 1000 19th Street near the Oceanfront. For security reasons, no bags, signs or banners will be permitted.