This hasn't been executed yet, but I don't think it should take more than 20-25 minutes.  If you know how to stretch it out, then let me know.

I was thinking of adding a part about "Who do you want to go to the party in your tummy?", but I'm not sure how that will pan out or how to simplify that question.

Here's the plan:
Party In My Tummy Listening Activity 20 minutes

Introduce Vocabulary <5

Play video <5
Give students worksheet

Play video again, have them fill in the blanks <5

Review answers. Pick students to write the correct word on the board <5

Sing the song together with the video <5