Historically, zombies have stayed away from these events. They may be dead, but they aren't stupid.
We have had problems the dreaded El Clayda and the fruit hordes. That was before my time though, and while El Roy was still among us... not that he isn't now, but then it was "in the flesh". 
El Clayda formation on the attack.
TheMom fighting them off.
AntiVenom and TC pausing after the battle.