Hi, "ça a été" means "it was", a été is the past form of the verb "être" wich means "to be". As for the example for the meal, if someon asks you " was your meal ok?"= " Est-ce que ton repas a été bon?" the answer can be "yes, it was"= "oui ça a été bon" or simply "ça a été". so in this case été has nothing to do with summer. I hope I was clear^__^