yes it is, unfortunately for you, you should've do it before the quest appeared
the quest appeared today so ive put the confectionary today after accepting the quest... announcement reffers you will get either a big confectionary or a huge one, so im kinda lost now: how can i get a huge one if the event is giving a normal one, not a big one. Confectionary is always a confectionary, either normal, big or huge, the quest doesnt specify but for sure you need a big confectionary to get the huge confectionary.
Announcement: "If you already have a Confectionery, you will be able to get its larger version, and if this one is also in your city, you will have a chance to obtain a brand new Huge Confectionery towards the end of the event!"
Quest giver says: "Get and build a Confectionary" and "Sell your Confectionary"... Reward: "1 Large Confectionary".
I got the Confectionary from my stock instead from the prizes, but i didnt put the normal wich i also have in stock since announcement refferred you could get a huge one if you had the big one in your city.