<p>SAN JOSE, Calif. -At the Cinco de Mayo celebrations of his childhood, John Zamora remembers the sound of mariachis, the taste of tamales and mischievous kids cracking confetti-filled eggshells on each other's heads.</p>
<p>When Zamora became a father, he brought his own children to the celebrations, then his grandchildren. But the crowds got bigger and people were drinking too much. Finally, he stopped going.</p>