I'd love to have seen this on the big screen, and well done on getting that organised... pretty impressive.
Yes, I agree it would have been heartbreaking to hear kids ask what a Dalek was. For those of us who grew up with the series they were a constant companion... even when not on screen they were present in other media: comics, novels, toys, annuals... just out of reach, but there they were, watching and waiting.
I really envy you seeing them on the silver screen.
(At least your girlfriend knew what a Dalek was, mine has never heard of them... even after giving her son an RC one a couple of years ago. Then again she's not British