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What was a BIG hit was decorating the autograph pen!!! This got the attention of the characters, which in turn gave the children a bit more interaction.
For my Dniece, I purchased a few plastic flowers & a bee & used masking tape to attach it to the Sharpie. For Dnephew, I got a cheap party rattle & some colored feathers & did the same, masking tape to a sharpie. The rattle was a hit.
One other thing, we used a note we preprinted in large bold type, that said "HI my name is.....Will you please sign my autograph book? Thank you" And used paperclips to attach it to the upper page & moved it after each autograph. This got alot of our autographs personalized instead of just a signature.