Grint has switched on the Christmas lights in Highgate in the past as well.
The festive free event was arranged by volunteers from the local community and funded by local businesses, schools and residents.
Since the Potter films ended, Grint has had roles in films including Into the White, and in Apple TV series Servant. He’s also appeared on stage, and in a number of Ed Sheeran’s music videos.
He told us he has “a couple of things” coming up next year, though he is not able to talk about them yet.
But compared with Radcliffe and Watson, Grint has found it relatively hard to break out of his Potter role.
Is he fed up of always being linked to a part he played decades ago? “No, absolutely not, I love it,” he said.
“It has a quite deep meaning to a lot of people of my generation, and even more to generations who are finding it now. It’s great. It gives me a lot of pride. It was such a huge thing.
“I don’t think I’ll ever quite step out of his shadow, but I’m fine with that.”