The play is about a drama group putting on a play. The first Act is made up of rehearsals and the issues that arise, and the second Act is the Dress Rehearsal, when the group runs through the entire play, “Popular Penguins”
While the Director, Stage hand and Detective have been written as male parts, they could equally be played by women, with references to he/him changed to she/her etc. The three friends visiting Edinburgh should be of similar age, but the remaining characters could be any age. 
The play is set in an Edinburgh hotel, and in the first scene, the set is very much a makeshift affair; little more than a church hall rehearsal space. The set gradually improves with each scene, but may still show signs of not being entirely finished at the dress rehearsal. The double doors should be hidden during the first scene.