We haven't done the cinema with Amelia. Jake will just about last and he's 4.5!! Mind, when Jake left preschool, they had a leaving party, and there was a kids entertainer there. She sat on the mat with the big kids, for an hour, just watching! So I guess she may be able to sit there. I might give it a go bit take Hubby so he can stay with Jake!
There will be a night when your LOs go through the night, just don't know when! It is easier when they share a room, if they have siblings, as they talk each other to sleep! Just 5 months ago, it was horrendous. She would scream, want my boob, wake at night etc. but now she gets into bed with her baby, ice cream van and wooden snake (!) and chats to jake for 20 before passing out in some weird shape.