Is my Nikon L820 smaller than 35mm?

I'm going to a concert tomorrow and the venue information said non-professional cameras smaller than 35mm is allowed but I can't tell if the Nikon L820 would be ok.

The venue information is not very well worded. I think they mean that the camera's sensor has to be smaller than a full frame 35mm camera. If that is he case, then the L820 is fine; it is way smaller than 35mm size. And while there's not really such a thing as a "professional camera" as such, the L820 certainly wouldn't be in such a category.

I imagine you will be OK, but sometimes event organisers don't know much about cameras and will refuse entry because they don't know what they're looking at.