A Google search shows up this

http://www.ue2008.fr/PFUE/lang/en/accueil/Saison_Culturelle_Europeenne/Pays/SLOVAQUIEenne

Franco-Slovak Tandem

21 November, at theOpéra de St-Étienne

23 November, at the Maison des Arts in Laon

25 November, at the Château de Chantilly

Opera
Mathilde de Guise , by Johann Nepomuk Hummel (1778-1837)
Concert version. Sung in Italian
Solamente Naturali Orchestra (ancient instruments)
Regional choir of Picardy, directed by: Bernard Spizzi
With:  Adriana Kohutkova, Hjördis Thébault, Eva Suskova, Philippe Do, Ondrej Saling, Pierre-Yves Pruvot and Martin Malachovsky.

It is the only source that I can find for this event and I can find no trace of it at any of the three venues. It therefore, regrettably, looks like a project that has failed to come to fruition.

I would be delighted to be proved wrong!

Best wishes

Ian Christians