The 26th International Bach Chamber Music Festival is a chamber music concert taking place in Riga at LNVM Riga Castle on 3 December 2026. The programme features all surviving 16th-century vocal polyphony composed in the territory of Latvia, highlighting the works of Paul Bucēns and other composers from the Riga Cathedral School. The ensemble Ars Antiqua Riga will perform under the artistic direction of Pēteris Vaickovskis, with Gregorian chant also included in the programme. Ars Antiqua Riga specialises in early music and vocal polyphony.