What happens at a book launch?

Question

I know this is a bit of a weird question but I am going to a book launch in a few weeks and I was curious about what these events are usually like. I have never been to one so I was wondering if anyone could give me an idea of what to expect?

Answer 1

They talk about the book.

Answer 2

Well usually... a band plays and a famous woman breaks a bottle champagne on the bow... Oh... you said Book launch not boat launch...