Unfortunately, this is something only you can decide on. However, given that you don't buy credits, here are a few things you might want to consider in making your decision: Do you have a sufficiently high happiness level that will allow you to add more buildings? If not, are you able to easily add coin items like skate parks, ball parks, cafes etc... to increase those levels? For this you will need a healthy coin buffer. If you are struggling in the happiness level component, biting the bullet and buying the candies to get the building might be a good idea. The building does give a pretty good happiness increase. If I were in your shoes and had a decent happiness level, I would pass on using up my cc and would focus on coin buildings until I could get enough factories to be able to compete in such events. They do come by fairly often so you can always shoot for the next building event.