With the one exception that is the great Derek Landy, who performs live author interviews like a comedian does stand-up, seeing authors live is not something I enjoy doing.
For years I got extremely excited whenever I saw an authors name on an event schedule near me, and took to going to see authors as often as I could afford to.
However, amoungst all the excitement of seeing the people who created some of my favorite worlds and characters in the flesh, I could never quiet get over the underlying disappointment.
My first piece of advice would have to be not to go and see two authors at once. I've made this mistake a few times now and found that whenever their are two authors on the stage at the same time their is an uncomfortable jockey for the spotlight.
Adding to this obvious discomfort between the two authors is the preference of the interviewer. I once saw such a live author interview where the interviewer was evidently more interested in one of the two authors over the other, knowing every book one author had written and none of the others.
This added to the fact that the crowd was made up of people mainly interested in one author, rather than both like myself, meant that the spotlight was entirely on the 'more interesting' author and the other was nearly completely ignored.
Another issue I have with going to see authors live is the number of ignorant questions coming from the audience, and occasionally from the interviewer. Though I do not blame people or want to discourage people from aski