You have the opportunity to unlock certain appliances and recipes during a goal period. During that period, whatever you unlock (appliances, recipes, and decor prizes) will stay unlocked and be buildable/buyable after the goal ends.
However, anything you did not unlock would stay locked by goal. Items do not auto-unlock after the goal ends
That being said, the team recently introduced "U-" Decorations and "Echo" Appliances, which make available appliances, recipes, and floor decorations from past goal events. These are duplicated items made purchasable for gems (no parts required) for players who may not have been around at the time of the goal event to be able to obtain.
If there is a specific appliance or goal prize decoration that you wish to see return as a "U-" decor or "Echo" appliance, please voice your suggestion in the Sale Suggestion Thread (seasonal) or Favorite Bakery Items thread