What level does zone commemoration become available?

I am b13 and it has not unlocked for my account

I had the same problem, I am base level 17 and my institution is level 12 but I still did not have sown commemoration. I think I am missing a research but I've don't know which one.

I think your state is new, and not in clash of zones phase, once it is started, zone commemoration will be unlocked

Zone comm will be unlocked on lvl 19 only