Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Rita had a birthday party. She was waiting for friends to show up. Nobody showed up. She felt really sad. She ended up crying and watching tv.
 selected sentence: Rita had a birthday party.

Today is Rita's birthday >Causes/Enables> Rita has a birthday party