There are so many things that I would ask or talk about, but I guess I would be in a state of shock if Elvis would stand before me and I would forget everything. Lol.
No really, I think I'd start easy: First of all I'd introduce myself and tell something about me (and ofcourse vica versa, although Elvis doesn't need an introduction. Lol.), so Elvis would not be talking to a totally stranger. Maybe we have some common interests (We're both capricorns, for instance, and I'm sure he would be pleased to hear that I was born on first Christmas day. Elvis loved Christmas. I sing too, I like horse riding etc) Also I'd ask what funny things he'd stumbled upon through the years on stage (I'm sure lots of funny things have happened before and during his concerts), What his plans are, what would really make him happy and ask him what his interests are, to start. I'd try not to ask questions that he heared over and over again. I'd just start simple and try to clear the air so he would feel at ease and comfortable, talking to me, not forced. (Just start in an easy way and the rest comes it's selve is my moto.)