To get a feel for whether an arts festival has truly penetrated a city’s psyche, it helps to strike up a conversation with local Starbucks baristas. That’s why I was grateful to be asked one recent evening in Toronto, “So what exactly is Luminato?”As the green-aproned server handed me a post-show cup of tea, I thought, good question: what is Luminato? Four years after the festival’s founding, it seems many Toronto residents remain unsure. I explained that it’s an arts festival with many different events, including performances at nearby theatres. As it happens, I had just come from a Luminato show featuring the actor John Malkovich.