Do you feel sad as the summer ends? The answer to that will depend a lot, I think, on whether or not you have school age children about to go back to school after the summer break!
I was always annoyed as a kid and later as a parent, to see the Back to School signs appear in the shops just before the children had even broken up for the holidays. As a kid, I hated being reminded. As a parent, I hated being nagged. (Still do, in fact! That approach has never worked on me!).