Pacific Beach does the Fourth of July the way the neighborhood does everything: louder than planned, friendlier than expected, and ending later than anyone's original intention. The parade through the neighborhood streets is an annual ritual that brings out the people who've lived here twenty years alongside the people who moved in last month, and neither group feels like they don't belong. The parade rolls through the heart of Pacific Beach in the morning — local groups, schools, businesses, the occasional antique car, the obligatory marching band. The block party follows in the afternoon. Mission Bay gets involved eventually. The whole thing is less organized than a civic event and …