I have been doing it almost every weekend for a few months now! This weekend I think I have to dress up as a mouse or a princess and do some "magic" one day, and then dress up as "elmo" the next day for a church picnic.
At first, I was reluctant to do it for my friend, who has a business of this and a giant closet full of disembodied character heads and sparkly outfits, but I figured "what the hey" and I LOVED it.
I have barely had a free weekend all summer, but it's worth it to see the smiles on kids' faces.
Sometimes they figure out that I'm a person, though and then they try to lift my princess dress or tug my costume. That's one of the job hazards. LOL