You might need ear plugs as well as blindfolds.
When children are in a group, have everybody close their eyes while you blindfold 5 of them, and guide them out the front and have them sit in a line, without talking have them feel the person next to them. Do not address them by name. Now move and disorientate them, can they re form their line without making a sound?
Tips: You may want to use ear plugs. Make sure you tie blindfolds nice and snug so their don’t become lose if touched.