Step 1: Understanding the Concept:
The question asks to identify the national organization responsible for organizing a specific series of festivals called 'Shakti' at seven Shakti Peeths (pilgrimage sites) to celebrate temple traditions.
Step 2: Detailed Explanation:
The Sangeet Natak Akademi, India's national academy for music, dance, and drama, is the apex body for the performing arts. One of its initiatives is to organize festivals that preserve and promote traditional and temple-based art forms. The series of festivals celebrating performing arts at various Shakti Peeths across the country is an initiative undertaken by the Sangeet Natak Akademi.
Step 3: Final Answer:
The Sangeet Natak Akademi is the organization that organises the Shakti festivals.