- It must be related in some way to DW (including expanded universe), even tangentially. So, if you wanted to have dinner with David Morrissey, that fits, as he did appear on the show.
- It must be possible. As far as we know, anyway, so no "become the Doctor's companion" (unless you can prove that it's possible, in which case, we are all coming with you). "Play the Doctor's companion" is possible.
- It must be something you haven't done before. So, I can't answer, "Meet Peter Davison", because I already have done so.
So, what's your dream? Think about it and be wild! It could be anything! Write an episode? Direct an episode? Become best friends with Peter Capaldi? Re-write and re-shoot the end of season 4 so that Donna doesn't get her mind wiped? ;) Destroy all copies of "Time-Flight" in the world so that we can claim it never existed? Discover a perfect copy of "The Highlanders"? (Oh, please please please!) Let's hear it!
Mine behind the cut...
I'd like to perform some Doctor Who music with the BBC National Orchestra of Wales, preferably with the orchestra being told not to snicker at me (I'm a terrible musician). Not a real performance - just a rehearsal is fine. I'd prefer the Series 2 theme, as it's the most orchestral and least electronic version, but really, any of the background music would be fine. I want to see the sheet music, sit among the musicians, and hear how all the parts balance. That's my dream.