Rehearsal is the time to run through the ceremony and the entire wedding party needs to be present to make sure everyone is familiar with their role in the ceremony.  

If you are being walked down the aisle by a parent or loved one they also need to be present.  

If you are interested in having someone do a reading or if musicians or DJ are scheduled for the ceremony, they might be OK with not being present but Amy, the wedding officiant, will need to speak with them personally before the ceremony and Amy arrives about 30 minutes before the ceremony to discuss with the musicians any thing to be alert to.    

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