Usually waivers like that are done months prior to the event and are coordinated with the event holder and the FAA.
https://www.faa.gov/about/initiatives/airshow/tfr/media/Airshow_TFR.pdf
I am not seeking to fly in an airshow, so that link is irrelevant to me.
But.... to the points above, the waiver.faa.gov site appears to be the right place to me?!?!?!
A) It has a specific drop down menu for TFRs.
B) Once TFR is selected, there are several sub-type TFRs drop downs to chose from i.e. NASCAR, MLB, NFL, INDY racing, and in my case NCAA football .
C) After you pick NCAA football then you get a very long drop down list of all of the major college stadiums we have all heard of, to pick your stadium, in my case, Tiger Stadium
Screen shot pic included. The only thing I typed in this shot was the altitude. Everything else I pulled from a drop down menu. That tends to make me think i am in the right place
