What are the laboratory sessions primarily designed for?

Dave: Uma, what do you want to do tomorrow?
Uma: I think I want to see everything, Dave.
Dave: Well, I’ll have to make a list of the places you want to see.
Uma: Dave, you’re going to be a real tourist guide. But I think I want to see all of London. And I must see the Changing of the Guards at Buckinghap Palace.
Dave: Ok, er, the Changing of the Guards. That’s fine. I’ll make a note of that.
Uma: And the zoo, I must go to the zoo because my sister told me that the elephants there are very sweet, and I have to go in the morning because she said they have a bath in the morning and they look awfully sweet. And, perhaps the British Museum, I think the British Museum.
Dave: Well you know, there’s a lot to see in the British Museum.
Uma: Oh I know, I know. And Madame Tussaud’s. My sister told me it was very interesting. And I think I’d like to go to the National Gallery. And then you know I have to be back at the hotel at six thirty.
Dave: Well Uma, I don’t think we’re going to be able to see everything.
Uma: Well in that case I want to see as much as possible. I’m only here for three weeks and I get lost when I go by myself.