For the first time in many years, Lathrop will not be playing host to the annual traditional fiesta celebration sponsored by its Sister City organization, the United Bacarreneos of America.The Hawaiian themed dinner-dance event will be held Saturday at the home of Tracy doctor Chuchi de la Cruz and his wife Lucy. Both are members of the group which was instrumental in establishing Lathrop and Bacarra as sister cities.The decision to locate the fiesta observance this year was a money-saving move, explained Emerson Castillo of Manteca, a retired school teacher and business owner who was voted this year as president of the Bacarreneos for the next two years. Elections were held at the annual general meeting and picnic in Lathrop.The occasion is always attended by members of the Lathrop Council; however, Castillo said he does not know which city officials will be attending this year.