On Sunday 8th March 2026 Ermioni celebrated their fifth annual local holiday.  This local holiday celebrates the Hellenic Third National Assembley that was held in Kastri/Ermioni between January and March 1827.  The annual anniversary had been established by Presidential Decree in March 2022 as a public holiday of local importance, selected to be the second Sunday of March.  The 3rd National Assembley in Kastri/Ermioni is an important historic event, which sent a strong message of unity and reconciliation to the Hellenic people for the continuation of the liberation struggle during the Greek War of Independence, laying the foundation for a united joint Assembley to meet in Trizina/Damalas.  Even before and during the Greek War of Independence, Ermioni had been called Kastri, reverting to its ancient Latin name of Hermione after the war, with its modern Greek spelling of Ermioni.

On Sunday morning, a Doxology church service was held in the Church of Aghia Panaghia (Holy Virgin) as the Byzantine Church of Aghoi Taxiarches is undergoing renovation work.  The Panaghia service was attended by Members of Parliament, The Mayor of Ermionida, representatives of local government and security forces, the President of Ermioni and a delegation of teachers and students from Ermioni schools.  Following the church service, a blessing was conducted opposite the Mitsas Memorial Garden next to the house where the National Assembley met, with the Hellenic anthem being played by the Ermionida philharmonic orchestra.

On Saturday evening (7th March) there was a presentation held at the Ermioni Syggrou Cultural Centre, with various speeches given regarding the 1827 3rd National Assembley held in Kastri/Ermioni at the 18th century Economou House (now the History and Folklore Museum of Ermioni), with a concert recital by the Ermionida Choral Society, concluding with the Hellenic national anthem.

The Third National Assembly of Greece was a long drawn-out affair, originally held at Nea Epidavros/Piada in April 1826, was soon dissolved due to the fall of the major Greek stronghold of Missolonghi.  The Assembly then reconvened separately in Aegina and Ermioni/Kastri from January to March 1827, due to rival revolutionary factions.  After much deliberation, the rival parties agreed to participate in a joint Assembly in Trizina/Damalas from 19th March until 5th May 1827, where the united Assembly adopted a new constitution, agreed to establish Nafplio as the future capital, and elected Ioannis Kapodistrias to become the Governor of Greece.