FunnyBones "Mystery Tour"

Let's watch this episode and find out the clues to solve the mystery!  What is it?

Complete the following excerpts:

1) Invitation Card: "Come to a ................at the end of the ............... Tour"
2) Clue: Find the .........................
3) Look! It's a ....................... for me!
4) We`ve got to ........... Big or we'll miss the party!
5) Big, how did you get into that ...........?
6) At the end: " Where's the ...........?" 
                        "I don't know it's a ......................!"