2. Olaf Mask
The tutorial linked below is in Italian but with the pictures, it is easy enough to understand. You can choose to simplify this mask so that you'll have enough time to make them for each kid invited to the party. I suggest adding holes by the “ears,” so that you can attach a string for wearing the mask. Using real twigs is not recommended because the kids might poke their eyes.
Tutorial Source: paneamoreecreativita.it