Hey Kate,
We love riding to Twins games, and have done it lots of times. When we've gone in the past, though, we've locked the bikes right in front of a Caribou, right in front of the windows and we never had any trouble. And we got to kind of snicker as we zipped by all the people sitting in their cars, waiting to get out of town.
Once we replace our bikes, I am pretty sure we will do it again. (That's why we're buying used bikes. In case the theft happens again...)
Molly
2007 Trek 5000
2009 Jamis Coda
1972 Schwinn Suburban
"I rejoice every time I see a woman ride by on a bike. It gives her a feeling of self-reliance and independence the moment she takes her seat; and away she goes, the picture of untrammelled womanhood."
Susan B. Anthony, 1896