I am not sure if this is 100% correct shelbourne but I think that referee's do a seminar every year and have to register with the FAI with regards to their grade, availibility etc.
As most Schoolboy games are played on a Saturday, maybe your referee's are unwilling to give up two days or are unable to give up two days due to work or family commitments.
As for priority, I would think that most referees just officiate at the games they are given by the fixtures secretaries.
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