Input: Relationship: 'be celebrate by', Argument/Subject 1: 'mass', Argument/Subject 2: 'bishop'

Answer: Allow me to announce the upcoming visit of our Superior General , His Lordship Bishop Bernard Fellay , who will be celebrating a Pontifical High Mass on Tuesday April 19 , at which the Tonsure will be conferred to our third year seminarians , and the major order of the Subdiaconate to our three fifth year seminarians .