Newscopy: "Burgerville is going to celebrate April first in a big way. Gordon Mailloux, owner, operator, and brave man is going to giving away free hamburgers in his restaurants at 14th and Geary Blvd. On April first from 2 p.m. until 10 p.m., if he lasts that long. The occasion, he says, is the first annual 'Happy Hamburger Day'..