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		 Time management.  
 
Something like the whomping willow mentioned above can take a large amount of time to setup (plus it requires a full time person) for about 2 seconds of fun per kid.  Make sure you have enough activities for them interested based on the length of the party.  Costumes and decorations do not keep kids busy and a busy kid is a happy kid. 
		
	
		
		
		
		
			
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				- Taking it one step at a time. 
			 
		
		
		
		
	
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