Getting a book signed at a gig

So Goldie is going to be playing in my town soon and I'm planning on taking his book there to hopefully get him to sign it for me. What's the best way/time to do this? I feel like during his set is probably not very cash money but this is Goldie - a name like that isn't exactly going to be hanging out at the bar.

Has anyone ever had something signed by a DJ at a gig without a meet n greet? Am I trying to do too much? Should I just enjoy the gig and be glad I was there without a Sharpie scribble to memorialize it?