You're better off just telling people about it, or wearing a shirt with Blockland and Blockhead on it or something.
Sticking it on a random pole where it's unlikely to be seen isn't really good advertising.
You're not even trying to get it to it's prospective audience.
If you atleast talk about it to other people, like children and teenagers, or wear a shirt with it on to School, then you're advertising it to the right people.
Besides, it might be that you're not supposed to just stick things to the pole.
And if it blows off, which it's likely to do, it's just causing littering.