I would possibly be asking why the carnival was held so late in the year. Although I do remember attending small school sports days when I was little and they always seemed to be on the coldest day of the year (and it was worse because you had to get up really early in the morning because we had to travel hours to where the carnival was being held).

I don't think that it is going to have any effect on his progress. Primary school (and especially infants) is so much more about learning how to get along with other kids and interact socially and learn how to learn. There is so much redundancy built into the system in the early years because sometimes it takes classes longer to understand concepts.

And there are so many advantages to attending a small school because you know the teachers and the students and the classes are generally smaller as well.