Booking a children's entertainer: any tips?

[FrenchGirl]

I'm thinking of booking a puppet show for dd's 6th birthday party in july. I have never booked an entertainer before.......
I found her in the yellow pages, and looked at her website (looked really good, nothing naff there). Have e-mailed her and she phoned back giving me a quote and has sent me info in the post (haven't received it yet).
Anything I should be checking, asking, doing?
Am complete novice and want to get it right for dd!!!! Tell me your advice and experiences (good and bad) please!

by the way, this is it

thanks Pamina, I felt maybe I should ask parents for recommendations but I like doing stuff my own way and finding something different.....
Fingers crossed

anymore?

thank you Pamina (you are my sole adviser but you are very wise!!!)
I have decided to book her so hope she's still free....

Was just going to say FrenchGirl be sure to book early. We tried to book a SmartyArty (a troupe of non-scary clown entertainers) but they were all booked ahead for 7 months)

we booked a clown for 1.5 hrs for our wedding. i specifically looked at adverts in parents/baby magazines and then went on gut instinct. I had a list of questions before i called them up which included references but didn't check up on them.
I went with the person that i felt most comfortable with on the phone.

hth

eeeeek clowns! am scared of them!
she sounded really nice on the phone, not trying to sell her act hard or anything, which I appreciated.