Sponsoring a team and writing it off?

[Robert Rodriguez]

I have a real estate business and wanted to get some advice on a current situation.

Can my real estate business sponsor a team in an adult flag football league?  The adult flag football league is ran by a city in my state.  They have to pay an $800 fee to play a season.  Can I be a sponsor for that team and pay their fee?  Will I be able to write this off at the end of the year? Would the answers change if I or a family member were to play for that team (can I no longer write it off?)

Thanks for your help and advice