City walls. Maybe a flash mob?

I walked here through my native city, looked at the walls. A lot of rock art, well, and as usual originality does not smell.

In general, I suggest to arrange a flash mob and leave my options:
1. Fibonacci series
2. pi number up to 15 characters
3. trigonometric theorems
etc.

It is natural to write in chalk, so that the first rain would return the rights to the usual “Kolya KAZEL” and other * yam.
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Not expected for me interested in the idea.
So, as a date I offer the 20th day of this month.
I myself for technical reasons, I can not be a coordinator. So if you want mercy, we ask.
PS: There is a platform for placing a photo report