Hey, how do I download it?
This is a warmer, and there is nothing to download. It's just an idea for your lesson, not a worksheet.
Tell them to imagine that this is the last class period, and they should stand up and pretend that they are saying farewell. If the students seem reluctant, help them with a few useful phrases such as "I'm going to miss you!" or "Promise me you'll stay in touch." Then have them mingle and say goodbye to at least three people.