Find someone who activity:

Each student is given a sheet of paper with which they can ask each other questions. E.g. "Did you eat an ice cream in summer?" Depending on how the classmates answer, the names are written in the correct field. 

After the activity, students can report on the information they received and turn the exercise into another speaking or writing activity.

"Susi, can you tell me who went hiking in summer...?"

During the exercise, the Past Simple is practiced. The students have to independently form correct questions in the Past Simple and can thus refresh and recall their "grammar knowledge" after the vacations.