This happens a lot and I have a couple of approaches to it.
First, if most of the dancers know what they are doing (and there is no 
knot of newbies somewhere at the end of a line), I won't worry about 
people jumping ahead, as a detailed description is not necessary.
If enough dancers may have a problem with a specific call, I'll be 
careful to set it up and explain it before I call it. So, for example 
after a ladies chain, I might say "The next call may be difficult for 
some. You will have 16 beats of music to cross the set and return to 
exactly where you are now, but we will do it in a specific way," Then 
after a bit more explanation, or even a demonstration if absolutely 
needed, I'll then call "Hey for 4, ladies pass right shoulders" I might 
also ask experienced dancers to look out for unsure new dancers and to 
help them by tapping their own right or left shoulder to show them which 
way to go. Get them involved in making sure it works. Get the new 
dancers to expect or ask for help. Make it a team effort and expect all 
to do their part so its fun for everyone.
Rich.
Andy Shore remarked on 2/6/2008 1:50 PM:
  This may have been covered before - I'm relatively
new to this list  
 and to contra calling (~6 months) but I'm an experienced MWSD caller  
 (18 years).
 Last weekend I called an open contra dance with a large number of  
 newcomers. Each time I introduced a new call in a walk-thru some of  
 the experienced dancers would "jump the gun" and (begin to) do the  
 call before I could even say "don't do it yet" or "but let me demo (or
 
 explain) it first".  This was a problem and a bit awkward to have to  
 ask them to "undo" or wait for me just a little bit more. It caused  
 confusion and took up valuable time.
 In my MWSD world, I have students for months at a time (learning large  
 numbers of calls) and they get used to my style of teaching and  
 introducing something new.  I'll say "new call time" to get their  
 attention and get a chance to explain what they will be doing before  
 they do it. Experienced dancers ("angels" in MWSD parlance) know not  
 to jump the gun. I even use a bit of the future tense to indicate that  
 I'm describing an action but not asking them to do it just yet, e.g.,  
 "you are going to cast 3/4 and then..." and my students and angels  
 know that this particular construction from me means "DON'T DO IT JUST  
 YET!".  But they are "trained" this way since they are in a continuing  
 class setting.
 How do you handle this in a contra setting. What language or other  
 techniques do you use to indicate that you're not quite yet done  
 talking and you want them to listen just a bit more or perhaps watch a  
 demo from one foursome?
 I'm thinking something like "In a minute, I'm going to ask you to do a  
 Ladies Chain and what you will be doing is..." (though that's too  
 wordy for my own taste).  I think it is important to name the call  
 before you describe the action, as this at least clues in the  
 experienced dancers what they'll be helping on (and it's just good  
 teaching). I've been to a dance where the caller tried to describe a  
 star promenade and butterfly whirl without using those terms and the  
 experienced dancers were confused. But how to keep them from jumping  
 the gun?
 Any insights appreciated!
 /Andy Shore
 
http://andyshore.com/
 "Men of few words are the best men" . - King Henry the Fifth (Act III,  
 Scene II).
 "Words, words, words." - Hamlet (Act II, scene ii).
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