There are tons of WW friendly recipes on the net if you search, for example at work my supervisor had a great recipe for a carrot slaw with raisins as well as a berry, whipped cream & angel food layered cake that were all low in points. She also made some muffins, I forget all the kinds but I do remember one being a carrot cake muffin that was like 4 or so points alone and if you put the optional glaze/frosting it was 5 or 6 points total. It was a good size muffin too.
Worst comes to worst, you could slice some strawberries and then bring along some lower calorie whipped topping and those little angel food cakes they sell at the store so people can put together their own strawberry shortcakes. That way, if you don't have enough points for the cake included you can still have yummy berries and cream (a great Summer dessert IMO).
Let's support each other on CalorieCount - I'm WasabiSushiSama there.