Tips for getting autographs

[Shangrila]

I will be attending my first FM concert ever in a couple of weeks (I'm really nervous). I have floor seats (aisle 1&2), but am about 15 rows back. What are my chances of getting an autograph? I plan on making a mad dash to the front with my tourbook and sharpie at all cost. I have never been to a concert in which seats are assigned, so what are my chances? Is this possible only for those who have front row seats? Can you fortunate Ledgies give me insight as to the opportunities available to get an autograph during the show? Thanks in advance.