Oh, how silly of me was to worry about all this! Valerie, who interviewed me, was warm, supportive and encouraging. She referred to her own volunteering experience to make me more comfortable and didn't test any of my knowledge :) She was curious why I wanted to volunteer and I was honest saying that the arts have always attracted me and I am dying to see the "behind the scenes" of a museum. After about 5 minutes of chatting, she made an absolutely accurate assessment of my aspirations and suggested that I volunteer at their communications department.
To say that I am excited is to say nothing - I am thrilled! Oh, how I look forward for them to call me back for an interview with the department personnel! And I can't wait to start!