Explanation:

- Chethiyagiri Vihara is associated with the rich historical and religious context of the Buddhist legacy in India.

- Sanchi is renowned as a UNESCO World Heritage site, famous for its ancient Buddhist stupas and monasteries.

- Option:1, Jain Festival - Sanchi is not notably linked with Jainism, and no major Jain festival is called Chethiyagiri Vihara.

- Option:2, Sikh Festival - Sanchi's historical background does not prominently connect with Sikh traditions.

- Option:3, Hindu Festival - While Hinduism is prevalent in the region, Chethiyagiri Vihara specifically relates to Buddhism.

- Option:4, Buddhist Festival - Chethiyagiri Vihara refers to a Buddhist celebration at Sanchi, signifying Buddhist rituals and historical significance.