As Chief U.S. District Judge Ruben Castillo spoke to the McHenry County Bar Association for the group’s Law Day celebration this year, another man sat nearby, watching proudly. The bar association’s first vice president at the time, the man chaired the Law Day Planning Committee and was responsible for Castillo’s involvement in the day. Like Castillo, Carlos S. Arevalo of Zukowski, Rogers, Flood & McArdle is Hispanic. And he’s the first Hispanic president in the McHenry County Bar …