All - I would also suggest clicking on several databases in EBSCO such as Academic Search, both business databases, the communications database and even the Psychology databases. Do a search on the following:
DE "SPORTS spectators" and attendance
You will get some scientific studies that ESSR faculty have done in re: to the socio-economic and psycho-social reasons why people attend or do not attend spectator sports.
Also see if any of the articles on "ARENA Football League" or "indoor football" meet your needs. There aren't that many but I do think some of the materials in re: to marketing, attendance, and promotional strategies on minor league baseball, soccer, and minor league hockey can help. let me know if you need more info.