To get to the field level, you must have a field level ticket. One exception in previous years is if you want to go to a food stand that they only have on field level.
The second issue (once you get down to field level) is to get down to the area by the Dodger dugout. If you get there really early, they will usually let you down in the area; closer to game time, they only let in those with tickets in the immediate section.
There is an autograph area outside the stadium in centerfield where they have one retired player signing. Here is the information on that:
<<<Located in centerfield, adults and children get the opportunity to meet and get autographs from a Dodger star of the past.
Upcoming 2011 Appearances
5/13 - Matt Luke
5/14 - Chuck Essegian
5/15 - Billy Ashley>>>