If Matiangi is serious let him reign in this wasteful association.
It is the Principals' association not that of their schools. So why do schools have to foot the bill? Let principals take money from their own pockets and fly to Mombasa with their mistresses and hookers every year. One principal I know spends 1 million each year on this conference. He also commits the school funds for various projects and schemes launched at this conference.
The trick used universally for public schools is to call a mini Board Meeting to approve the expenditure. Since each Board member will get at least 5000 (Sitting Allowance) for sitting for three minutes and refunded transport costs at the same level (5000 for those who walked etc), they would not risk their membership to this mini board by being obstructionist.