When I got to where i had like 25 survivors and 100% happiness, it was impossible to even get anywhere cause they celebrated so often, it pissed me off, any tips on how to stop these celebrations?
It might be advisable to suppress the "Zombies are People Too" book and nip the whole thing in the bud, but banning the book will deny you a valuable happiness bonus. I haven't played on the high difficulties yet, but I would suggest banning the book.