The problem is not fiber or anything else. All of the major carriers have towers in the area that provide service to Cajun Field. The issue is bandwidth and simultaneous users.
My suggestion would be to use the light poles as a small cell that would provide service back to a Hub Site for service. It would allow more users and more bandwidth. By using the light poles at Cajun Field you would be able to provide service to all of UL's athletic venues.
An example of this on a larger scale would be at Texas A&M, we installed over 100 small cells to provide coverage at their football games. Now it is not cheap, but it is effective.