block hours in the mornings

We are looking for native English teachers to cover some work (not teaching, but assisting an evaluator to run tests) from 8.30 till 13.30 hrs in Valdemoro. 
We have a calendar with the dates. There are 19 days from now till June. Each day is paid 62.5€ gross for workers. 
All teachers doesn´t necessarily need to cover all the dates, if not available.
Those are the days:

APRIL:-29 and 30th
MAYO: 7, 8, 17, 28, 31 
June: 3, 4, 5, 6, 10, 11, 12, 13, 14, 17, 24, 28
We take teachers to Valdemoro by car that leaves from Moncloa at 7.30 am, so they can be in Valdemoro at 8.30 h. We just take teachers there, but we are unable to bring the teachers back. So you would have to find your way back into town.
All teachers have to be native English speakers.