I just thought of this, and I want you to view it from your own perspective. As everyone hopes that more people get to believe and use bitcoins, I think bitcoins can gain more new users on a large scale if anyone (whales ) can place their advert through a popular football club just as some companies do sponsor football league. I think this will send a strong message to billions of people across the world who do know but does not embrace Bitcoin usage.
Let me site another example, let's take for instance, a club announces that they will pay their players in BTC. This news can also help people adopt BTC.
It is bitcoin and not bitcoins.
Concerning your proposed advertisement in the boards during football matches and other places. I think this proposal would have been better if it was the first year of Bitcoin launch. I tell you that no single person that is playing football or even watching football that does not know about bitcoin. Anyone that has access to internet knows about Bitcoin and almost has heard about it. So, your proposal is necessary and no one will take that tax because bitcoin is a decentralized coin.
People that do not know about bitcoin are people that are living in rural places and maybe who do not have access to internet. Bitcoin does not beg people to be aware of it. It is just the battle of government to hide Bitcoin. If government should give bitcoin a level-playing ground, the adoption will be massive.
Bitcoin has become popular beyond our imagination, even in rural areas people know about it but they still don't really care much about it. Indeed, people need bitcoin, bitcoin does not need to beg someone to use it. So it is not necessary to find a way to promote it to people in the same way that companies promote their products. Using bitcoin has great benefits, so those who really need it will find it. We don't have to come up with all sorts of ways to promote it as a product to sell for a profit.
OP, don't try to think of huge missions to introduce people to bitcoin. If you really want to spread bitcoin to everyone, the first thing you need to do is introduce it to your loved ones. If you can do that, it will be an important contribution to bitcoin.