SALZBURG, Austria — Next summer, the Salzburg Festival, the largest and most important annual event in classical music, turns 100.

This is a big deal, and will be celebrated as such — with exhibitions in this idyllic city and elsewhere, symposiums, and opera, concert and drama productions elaborate enough to require a bump in the already generous budget. (The 2020 allocation is north of 66 million euros, or $73 million, for a six-week festival.)

“There’s an unbelievable history,” Markus Hinterhäuser , the festival’s artistic director since 2017, said in an interview here on Monday. “From the founders — from Strauss and Reinhardt — to our time: It’s a panorama.”

But if a centennial is about as major a milestone as an institution gets — particularly an institution as obsessed with its illustrious past as this one — Salzburg’s leaders also want you to know: It’s not too big of a deal.