STOCKTON — For the first time in its 40-year history, the California Hispanic Chambers of Commerce will hold its annual statewide convention in Stockton.The selection also is a first for the city, which has been host to big, popular events, but not a large professional development conference, said Jesús Andrade, San Joaquin County Hispanic Chamber of Commerce chief executive officer, who helped secure the convention.The annual CHCC convention will be Aug.