I would go with Thursday/Friday mainly because Mondays tend to be public holidays a lot of the time and you still have to pay even though they don't go!! (If it's like cc that you are talking about or kinder?) Also going 2 days in a row would be an advantage in consistency as well.
Oh the other factors I forgot to mention was that monday was an older and bigger group of kids going off to kindy next year and friday is a smaller and younger group of kids going to kindy.
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