Here's an idea, get your Bitcoin wallet QR Code on a sign and hold it up at every single sports venue you go to. Just need to make it on camera once. You will raise money! 
This probably the closest I will get to a stadium
http://oi39.tinypic.com/2s1rxtv.jpg
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If you want to donate :
BTC: 1BwARzYgeBvkye571TmgygajXnSbv8Htyx
LTC: LTajCNJiWSDqjNaxWxz6cpKzzm4U2FnSRy
THANK YOU
