Hey - I have no problem with someone trying to make a go at their own business. Good luck to you - I hope it works out!
I know there are probably many people out there that aren't regular tailgaters that may be interested in something like this.
You may want to look at targeting companies that have season tickets to host some corporate tailgates. I'll bet that's where you could make a splash. Just like there are event coordinators or people who make a living at putting on conventions or trade shows.
In my line of business we throw one or two tailgates a year in C-town, Detroit, Pit and C-bus for OSU games and I'll tell you that my reps would love to have someone put these together for them rather than have a go at it themselves.
Keep in mind that this is, in essence, a work function for many of them and they don't get the enjoyment out of it that we fans do for our teams. While I love to and still help throw the tailgates in Cleveland, when I was a rep I HATED having to put together tailgates in pittspuke and Detroit.
Just a suggestion - but I'd bet that would be a good market for you to explore.