Participating at the Hanoi Open Theater Festival 2026, the opera "Sacred Marks of Hanoi" takes the audience back to the 60 days and nights of fighting in late 1946 and early 1947 of the capital's army and people. Using traditional opera language combined with new staging, music and stage processing, the work not only recreates a heroic historical period but also conveys a message about patriotism, sacrifice and responsibility to preserve the values ​​that have made Hanoi's spirit.