This Event "Sweet Treat Showdown 6 - Cozy Home" starts on the 26 Nov and is available for 15 days.
Sweet Treat Challenge
Your Sims will have a match with an opponent professional chef to bake over several rounds by creating pastries and desserts. Each round if your sims win, those rewards will be added to the Prize Basket. Your Sims can choose to forfeit (collect the content they have in their Prize Basket and leave) or they can decide to continue to the next round.