I don't know whose idea this was but it must be one of the silliest ideas the U2 camp has come up with. It's a shame as there are lots of other more appropriate ways to show that Aung Sang Suu Kyi and Burma have not been forgotten.
Below find the idiots guide to making a mask from U2.com

Print it off.
Cut it out.
Attach some elastic or string to the sides.
Try it on for size.(If you're really clever print it on card or laminate it)
Or tape on a little handle to hold it in front of your face.
Wear it to work or college. Wear it on the bus or the train.
Wear it in the pub or at the shops.
And don't forget.
Bring it to a U2 show.
Put it on with thousands of others when the band strike up the opening bars of Walk On.
Wear it to to show the world that you have not forgotten. 'Please use your liberty to promote ours,' says Aung San Suu Kyi. Use your liberty to promote hers. And the liberty of the people of Burma.
WEAR THE MASK.