I can understand a school trip at the end of the school year, but not 2 week into a new term. Dont get it
One year at my school we had an Ofsted at the end of the school year. The school openly said that if we were to get an "Outstanding" report, then the whole school would get a trip to Alton as a reward. The school duly went on to get its traditional "Outstanding" report, and I can't quite recall why but the trip was delayed until the September. I felt for the 6.2s that had left in the summer, they lost out on their trip, while the pesky new Y7s got a trip they didn't really warrant!
I also think another plus point is two weeks into the start of a new school year you haven't really got your teeth into anything major, there's no exams etc. and a point earlier was made about helping people settle in. Whereas at the end of term some people may have exams and it's be hard to plan around if the entire school is going!