I should check if there's existing academic material on this. If not, I might need to structure the paper based on what I know about Tamil performing arts and cultural practices. Thiraikathai could be part of a larger festival or tradition. Eluthalam might relate to a ritual or a specific event within a festival. Since the user wants a PDF, maybe the paper should be structured with sections like Introduction, Cultural Significance, Rituals, Social Impact, Challenges, Modern Adaptations, and Conclusion.