I personally saw this question being a focal point of those issues being discussed when at a meeting prior to Bernie's visit to Portland where they moved it to the Rose Garden which itself had to turn away 8000 people. It is a tough question every place they go. They don't want to get a huge venue like Trump did and only half fill it, but they want to make sure they can accomodate as many people as they can that grows HEAVILY after they announce him coming at each place.
If he stands on the corner of Burlington and Clinton in Iowa City, he can note there that there is more traffic that goes up and down Burlington than goes up and down Clinton there! 
https://www.google.com/maps/%4041.6578742,-91.534767,3a,75y,141.18h,88.95t/data=!3m6!1e1!3m4!1s3iRXTWJAfSTsFsX9LhFD7g!2e0!7i13312!8i6656
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