What is the fine-grained topic of the following text: The sign is named after the Rabaa al-Adawiya Square in Nasr City, Cairo Governorate, which surrounds the Rabaa al-Adawiya Mosque, where a sit-in was held by the Muslim Brotherhood and its supporters to celebrate the one-year anniversary of Morsi's inauguration. Only return the topic.
Rabaa al-Adawiya Square and its significance to the Muslim Brotherhood and Morsi's inauguration anniversary celebration.