It's not kids unfriendly, but it is large and very very crowded. There's also a relative lack of facilities, like food is limited, you definitely can't drive there, queues for some of the toilets, so those things might be concerns. Would you take your kid to a large, slightly disorganized music festival? If yes then you should be alright.

Haven't seen any kids so far.

I think it's doable but not a lot of fun. You will have to walk from one lecture to another outside, lots of crowding in plenty of spots.

Public transport is also full.

But there are two bigger rooms (one old one new) with good talks you can always go to

They seem to have kids track this year, never seen that before.