The number of mini desserts needed for 50 people will depend on various factors such as the types of desserts, portion sizes, and guests' preferences. As a general guideline, you can estimate around 2-3 mini desserts per person. This would mean preparing approximately 100-150 mini desserts for a group of 50 people. However, it's always a good idea to consider the event's duration, other food options available, and the overall balance of the dessert table.