What is the fine-grained topic of the following text: One year of demolition - Remembering the iconic Hall of Nations, excerpts from research interviews In Architecture: Challenges and Opportunities - A panel discussion held at the annual conference of the National Association of Students of Architecture at Kochi, Edited by Nirmal Kulkarni. Only return the topic.
Remembering the Hall of Nations and discussing architectural challenges and opportunities at the National Association of Students of Architecture conference.