Recent highlights include his hugely successful and much-publicised jump-in to conduct the London Philharmonic Orchestra in Brahms 4 at the Megaron when Cannelakis was taken ill at the very last-minute, and a concert with the Ulster Orchestra with soloist Mahan Esfahani which was broadcast on BBC Radio 3.
Elsewhere Grammenos has conducted the Belgian National Orchestra, Orchestre Symphonique de Québec, Cameristi della Scala with soloists Khatia Buniatishvili & Renaud Capucon amongst others and in the coming months he looks forward to making his debut with the RTE Concert Orchestra (Dublin).
In July 2024, he will make his USA debut with the Houston Symphony Orchestra.
In the opera house Grammenos has conducted the English Touring Opera in a production of Puccini La Bohème which received widespread critical acclaim and at Nevill Holt Opera he conducted Rossini La Cenerentola with the Royal Northern Sinfonia. In his role as Artistic Director of the Greek Youth Symphony Orchestra, he performs regularly at the Megaron and has taken them twice to perform at Berlin’s Konzerthaus. In November 2024, the orchestra will perform at Carnegie Hall under the direction of Grammenos.