I found this lovely, free resource for years 3 - 6:
lifejacketsuk.org/get-the-challenge-pack/
It's 3 reading / PSHE activities which are easy-to-follow. I did 2 of them with my year 6 class last term and they fed in well to a migration topic I was teaching but I'm thinking they might be a nice 'getting to know the class' activity in Sep as it could lead into interesting discussions.
Has anyone else found any good free resources they will use in the first few weeks back?