This is a project that can be spread among 3 class periods.
In the first one you explain the whole project. The students create their favorite celebrity profile (without mentioning the name of the celebrity). They include the QR code with the photo of the celebrity. They can use the sample document I made as inspiration (the celebrity that I described is Enrique Iglesias, page 1 of the activity). You can let them know what your expectations are (page two of the activity)
Once you corrected their descriptions and they added the QR codes they can print them and you can post the documents on the walls around the room.
In the following class periods students walk around the room and read the descriptions. They guess who the celebrities are and write it down in the document (page 3).
The following class period they bring their phones to class (with QR reader app they downloaded beforehand - for example qrbot) and scan the QR codes to see whether they were right or not (and write it down in the same chart next to their guesses).
You can decide whether you give a prize to the ones who guessed everyone correctly.