A special Blue Mass is being held this morning at St. Anthony of Padua Catholic Church in honor of all first responders.The service, which is being held for the second year in a row, is in conjunction with the national commemoration of Sept. 11, when thousands of people including many first responders – firefighters, police, emergency personnel who lost their lives in the line of duty – perished during the terrorist attacks at the World Trade Center, the Pentagon in Arlington, Va., and in a field near Shanksville, Pennsylvania, 11 years ago.The Mass will begin at 9 a.m. St. Anthony School Principal Mary Lou Hoffman said invitations were sent out to all first responders – “all of the Sheriff’s (deputies), California Highway Patrol, police, firefighters – for this morning’s service. About “30 or so” first responders are expected to be there this morning.For the second year in a row, members of the honor guard of the Knights of Columbus have volunteered to escort all of the first responders to their pews, Hoffman said.“The Knights are very, very good. They asked us if they could do it.