I photographed him wearing a batman mask that covered the top half of his face (he was still recognizable). I used the picture as the background of the invite. The invite read something like: Top Secret: [child's name] thinks you have what it takes to be a super hero, we'd like to invite you to our super hero training camp located at [address, date & time]. RSVP to Super-Mom" and Super food & combat gear will be provided.