A 'find someone who' is an activity which involves students milling round the class speaking to everyone. They need to complete a worksheet that requires them to 'find someone who' fits a series of statements, such as 'Find
someone who....likes eating fish/...comes to school on the bus/...wears jeans every day, etc.
This is often used as a 'getting-to-know-you' activity, but it is also very useful as a way of practising specific language items.