Ask HN: Pitching startup concept at an exhibition/showcase

Hi,

We have to pitch our startup concept at an exhibition/showcase among other startups and based on this (in combination with our concept proposal) we may be looking at a business idea prize (competition similar to the MIT $100k but on a smaller scale).

So far in preparation for the exhibition we are looking into perfecting our basic elevator pitch. Time constraints prevent us having a prototype to demo.

Howver, I'd love to hear people's advice on this kind of situation - i.e. what would you take/show, what would you make sure you know, what questions would you make sure you are ready to answer? etc.