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Tiny T
For starters, welcome to the forum. We're glad you found us.
I just dont' see how you can cram all those activities into an hour and be fair to all the kids. Face Painting alone, if you spend five minutes on each face, that is still only 12 kids an hour! And no clown wants a kid to feel like they were left out. See if they would go for two hours instead, you could stroll and do balloons, , maybe sing too.
Face painting is a time consuming thing. even if you only paint "cheek art". It still takes time. I am torn as to what advice to give. One thing I do reccommend for face painters, is to make a sign to hang around a kids neck that says" I'm the last one in line." Thay way when you look down the line of eager participants and know you are going to run out of time, you can give this to the last kid to hand around their neck. This will tell any others that get in line that you WILL STOP then you are finished with this kid, and save dissappointing others.
I dunno, Level with the people. tell them what they want is more than one clown can handle for the time limit given and be fair to the kids who come.I myself would likely say a hundred bucks. then be prepared to stay an extra half hour to an hour if needed. Yes, you are there to fullfill their needs. but you are also there to make a lot of kids happy. and even two hours in only two minutes per kid. Doing basic balloons take about one minute each
http://clown-forum.com/ftopict-608.html
some more info on pricing to consider before quoting them.
Good Luck!