I had this question to my most recent post about follow-up:"Just curious what this updating looks like...as a young singer, I have been told this, but am unsure of what to keep them apprised of? I don't want to be a bother to them as busy directors and managers...what would be an appropriate way to follow up?"
The easiest way, and the one I suggest is a simple e-mail (since I will have given the singer my card with that info). Something along the lines of": "Mr. Smith, you asked me to keep you apprised of my activities, and I wanted to let you know that I have been accepted into the Apprentice program at the Acme Opera Company, where I will be singing the main stage role of Musetta in La Boheme. I look forward to singing for you again. Regards, Sally Brown"
Something like that will certainly remind me of the fact that I liked your audition, and that you have continued to make progress in your career.