Last year was the first baseball game we'd attended after going gluten free. Obviously hot dogs and beer were off the proverbial plate -- that's gluten central! I researched online and found that we could bring in sandwiches, etc. provided they were in clear plastic bags and we had no glass bottles or other contraband - still, it would be a pain in the butt for a lousy, soggy-by-the-time-we-ate-it sandwich. No, thanks. So - we decided to bring football fan culture to baseball and tailgate before the game.
We loaded up my father-in-law's SUV with a small grill and a cooler filled with hot dogs, hamburgers, cheese and crackers, chips, and beer (yes, with gluten free buns and alcohol) and had a parking lot BBQ. It was great and I would definitely do it again, provided Yankee tickets at the new stadium were priced reasonably and we could have afforded tickets this year (Sorry, I'm not going to pay in the 4 digits for 2 tickets!)
Anyway, now gluten free people have an option - the Phillies are not only hosting a Celiac awareness night on July 20th but are also offering gluten free hot dog buns in certain sections of the Citizens Bank Park stadium.
Here's the link to a news article with more information: http://www.examiner.com/x-10302-Philadelphia-Triathlon-Examiner~y2009m6d29-Citizens-Bank-Park-offers-glutenfree-food-Phillies-will-host-Celiac-Awareness-Night
Now, Yankee Stadium needs to offer gluten free stuff as well! (Attn Steinbrenner: Bard's beer). ;-)