overview opening hours programme O2 universum will serve as a modern multifunctional center for holding large international congresses and corporate events. O2 universum will offer up to 38 halls of various sizes with a total capacity of 10,000 visitors. The largest hall with a capacity of up to 4.5 thousand people will also be used as a venue for medium-sized concerts and sports matches. opening hours box offices TICKETMASTER BOX OFFICE (directly at O2 universum) Tel.: +420 266 771 721 OPENING HOURS: 2 hours before the event opens, BUT ONLY ON THE SPECIFIC DAY WHEN THE CONCERT IS TAKING PLACE. In other days please visit Ticketmaster box office at O2 arena. TICKETPORTAL BOX OFFICE (directly at O2 universum) Tel.: +420 266 771 740 OPENING HOURS: 13pm to approx. 1 hour after start of the show, ONLY ON THE SHOW DAY. In other days please visit Ticketportal box office at O2 arena. more about opening hours festivals Comic-Con 13. 3. 2026—15. 3. 2026 O2 universum large events David Byrne 17. 6. 2026, 20:00 O2 universum opening hours box offices TICKETMASTER BOX OFFICE (directly at O2 universum) Tel.: +420 266 771 721 OPENING HOURS: 2 hours before the event opens, BUT ONLY ON THE SPECIFIC DAY WHEN THE CONCERT IS TAKING PLACE. In other days please visit Ticketmaster box office at O2 arena. TICKETPORTAL BOX OFFICE (directly at O2 universum) Tel.: +420 266 771 740 OPENING HOURS: 13pm to approx. 1 hour after start of the show, ONLY ON THE SHOW DAY. In other days please visit Ticketportal box office at O2 arena.