Best events: Zagreb, Croatia - September 2026

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Zagreb, Croatia, has a particularly strong cultural calendar in September 2026. This guide focuses on verified events in the Croatian capital during the upcoming month. The main concentration is the Zagreb Opera Festival, which brings international guest companies, concerts, opera and public discussions to central Zagreb. The programme spans the Croatian National Theatre’s main stage, its foyer and the HNK2 venue. Families can find a children’s opera, while theatre-goers can also see George Bernard Shaw’s Arms and the Man. Several daytime talks and book presentations have confirmed free entry. Evening performances provide options for visitors building a culture-focused city break. Dates and programme times below are based on current official listings and may be worth rechecking before travel. The selection stays within Zagreb, Croatia, rather than adding events from elsewhere in the country. September’s schedule gives visitors a useful mix of major productions, intimate foyer events and behind-the-scenes experiences.

Early September at the Croatian National Theatre

Arms and the Man — Zagreb, Croatia — 4 September 2026

Date/time: Friday, 4 September 2026, 19:30.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: See the Ivan Vazov National Theatre’s staging of George Bernard Shaw’s anti-war comedy, directed by John Malkovich, as part of the HNK2EU European Theatre Series.

166 Seasons Behind the Curtains theatre tour — Zagreb, Croatia — 5 September 2026

Date/time: Saturday, 5 September 2026, 15:00.
Venue/city: Croatian National Theatre, Zagreb, Croatia.
Why go: This guided tour explores the theatre’s history and working backstage spaces, with the theatre atrium as the meeting point.

Zagreb Opera Festival opening weekend

Festival Morning: Overture to the New Opera Seasons — Zagreb, Croatia — 11 September 2026

Date/time: Friday, 11 September 2026, 11:00.
Venue/city: Croatian National Theatre, Zagreb, Croatia.
Why go: Join an informal festival-opening gathering devoted to the Opera Festival and announcements about the future of the Croatian National Theatre Opera Company.

Aida — Zagreb, Croatia — 11 September 2026

Date/time: Friday, 11 September 2026, 19:30.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: The festival opening presents Verdi’s Aida, an international co-production with Teatro Massimo in Palermo and the Csokonai National Theatre in Debrecen, conducted by Pier Giorgio Morandi.
Tickets/entry: The official schedule lists this performance as sold out.

Gita and the Hidden World — Zagreb, Croatia — 12 September 2026

Date/time: Saturday, 12 September 2026, 11:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: Borna Erceg’s children’s opera was created with Zagreb’s Mala Scena Theatre and offers a family-friendly festival option.

The Cook Opera! — Zagreb, Croatia — 12 September 2026

Date/time: Saturday, 12 September 2026, 17:30.
Venue/city: HNK2, Božidara Adžije 7a, Zagreb, Croatia.
Why go: Compagnie Minute Papillon brings a French production that combines music, theatre and humour in an approachable opera format.

Inaugural Concert of the Dunja Vejzović Music Centre — Zagreb, Croatia — 13 September 2026

Date/time: Sunday, 13 September 2026, 19:30.
Venue/city: HNK2, Božidara Adžije 7a, Zagreb, Croatia.
Why go: Hear Diana Haller, Dora Jana Klarić, Evelin Novak, Marie-Pierre Roy, Dubravka Šeparović Mušović, Tomislav Jukić and Krešimir Stražanac with the Croatian Radiotelevision Symphony Orchestra conducted by Valentin Egel.

Opera, music and public conversations in central Zagreb

Fearless Croatian Women book presentation — Zagreb, Croatia — 14 September 2026

Date/time: Monday, 14 September 2026, 12:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: Tatjana Barat and Yellow Yuri present a book celebrating notable Croatian women as part of the festival’s accompanying programme.
Tickets/entry: Free entry.

The Musical Legacy of Bela pl. Adamović Čepinski recording presentation — Zagreb, Croatia — 14 September 2026

Date/time: Monday, 14 September 2026, 17:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: Nota Bene Records presents a recording devoted to the musical heritage and work of Bela pl. Adamović Čepinski.
Tickets/entry: Free entry.

The Italian Girl in Algiers — Zagreb, Croatia — 14 September 2026

Date/time: Monday, 14 September 2026, 19:30.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: The Polish Royal Opera returns to Zagreb with Rossini’s comic opera, conducted by Dawid Runtz and directed by Jitka Stokalska.

Venus and Adonis — Zagreb, Croatia — 15 September 2026

Date/time: Tuesday, 15 September 2026, 19:30.
Venue/city: HNK2, Božidara Adžije 7a, Zagreb, Croatia.
Why go: The Croatian Baroque Ensemble, Cantoría from Spain and the Chamber Choir perform John Blow’s Venus and Adonis under conductor Jorge Losana.

International Forum on Audience Development — Zagreb, Croatia — 16 September 2026

Date/time: Wednesday, 16 September 2026, 10:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: The forum, titled Our Audiences of the Future, considers how cultural organisations can understand, attract and build lasting relationships with new audiences.
Tickets/entry: Free entry.

Green Culture conference — Zagreb, Croatia — 17 September 2026

Date/time: Thursday, 17 September 2026, 09:30.
Venue/city: HNK2, Božidara Adžije 7a, Zagreb, Croatia.
Why go: This international conference examines culture’s role in responding to environmental and climate challenges.
Tickets/entry: Free entry.

Jakov Gotovac’s Opera Necklace book presentation — Zagreb, Croatia — 17 September 2026

Date/time: Thursday, 17 September 2026, 11:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: Learn about Siniša Vuković’s complete historiography of Jakov Gotovac’s musical and stage works in a programme featuring theatre and music specialists.
Tickets/entry: Free entry.

Lakmé — Zagreb, Croatia — 17 September 2026

Date/time: Thursday, 17 September 2026, 18:00.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: The Slovene National Theatre Maribor performs Léo Delibes’ Lakmé, conducted by Mojca Lavrenčič and directed by Pier Francesco Maestrini.

Unclaimed Memories, Unsolicited Narratives book presentation — Zagreb, Croatia — 18 September 2026

Date/time: Friday, 18 September 2026, 11:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: Croatian Centre ITI presents Darko Lukić’s collection of studies on contemporary Croatian playwrights and directors.
Tickets/entry: Free entry.

Gita and the Hidden World — Zagreb, Croatia — 19 September 2026

Date/time: Saturday, 19 September 2026, 11:00.
Venue/city: Croatian National Theatre foyer, Zagreb, Croatia.
Why go: This repeat performance is a convenient daytime choice for families visiting Zagreb during the festival’s final weekend.

Gala Concert featuring Piotr Beczała and Marigona Qerkezi — Zagreb, Croatia — 20 September 2026

Date/time: Sunday, 20 September 2026, 19:30.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: The festival closes with tenor Piotr Beczała, soprano Marigona Qerkezi, Croatian National Theatre soloists and orchestra, conducted by Pier Giorgio Morandi.

Late-September opera and theatre tour

Aida — Zagreb, Croatia — 24 September 2026

Date/time: Thursday, 24 September 2026, 19:30.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: Catch Verdi’s Aida after the festival, in the Croatian National Theatre’s regular September programme.

Aida — Zagreb, Croatia — 26 September 2026

Date/time: Saturday, 26 September 2026, 18:00.
Venue/city: Croatian National Theatre main stage, Zagreb, Croatia.
Why go: This earlier Saturday performance is a useful option for a weekend in Zagreb, Croatia.

166 Seasons Behind the Curtains theatre tour — Zagreb, Croatia — 26 September 2026

Date/time: Saturday, 26 September 2026, 15:00.
Venue/city: Croatian National Theatre, Zagreb, Croatia.
Why go: The afternoon tour offers another opportunity to see behind the scenes before the evening opera programme.

Practical planning tips for Zagreb, Croatia

Book sought-after theatre performances early, especially festival opening and closing events, and confirm availability shortly before travelling.
Central Zagreb venues are well connected by the city tram network, so allow extra time for evening journeys and check the stop closest to your venue.
September can bring warm afternoons and cooler, wetter evenings in Zagreb; pack a light waterproof layer and comfortable walking shoes.
For morning talks or foyer events, arrive a little early because entry and seating arrangements can differ from main-stage performances.

Plan each day around the confirmed start time so that Zagreb’s September culture programme remains enjoyable and unhurried.