Identify the Following as an Experiment or an Observational Study

Identify the following as an experiment or an observational study.
-At the opening night of a play, the owner of the theater would like to offer free theater membership to a few
audience members. The owner announces that each person seated in the middle seat of a row will receive free
membership to the theater. The theater consists of ten rows each with nineteen seats. There are no empty seats
that night.