On 4 March 2026, Her Royal Highness delivered a special lecture to the Minister of Foreign Affairs, ministry executives, ambassadors, consuls-general, and military attachés, along with their spouses at the Ministry of Foreign Affairs. In total, around 150 persons attended the special lecture, including Prime Minister Anutin Charnvirakul.

The lecture covered two main topics: protocol for receiving royal visits and Thai national dress (Chud Thai Phra Rachaniyom). Her Royal Highness provided guidance on various matters of conduct, as well as sharing accounts of her personal royal duties undertaken for the benefit of the nation, including her activities in music, sports, and arts.

On this occasion, Her Royal Highness graced the exhibition titled "Princess Sirivannavari Nariratana Rajakanya and Her Royal Duties in Foreign Affairs," organized by the Ministry to honour and pay tribute to Her Royal Highness’s contributions across various dimensions of international engagement, e.g. royal duties in fostering diplomatic relations with foreign countries, royal duties inpromoting Thailand's image through music, sports, Thai silk and handicrafts, especially the promotion of Chud Thai Phra Rajaniyom, and the proposal to inscribe "Thai Dress: Knowledge, Craftsmanship and Practices of Thai National Costume" on the UNESCO Intangible Cultural Heritage list, etc.

Her Royal Highness also viewed a Thai fabric showcase by the Foundation for the Promotion of Supplementary Occupations and Related Techniques of Her Majesty Queen Sirikit (SUPPORT Foundation/Silpachip Foundation) and outstanding OTOP products from various provinces and visited to the European Affairs Department, as well as the Situation Monitoring Center for assessing tensions in the Middle East (War Room).