Break leaves over their curds to keep any sun (Not round here!) off them.
Pulling them with roots attached and keeping them in a cool bright place hanging up will keep the curds fresh but the leaves do wilt. Don't trim them back until the morning of the show.
I have found trying to keep them in the fridge partly trimmed but not in a plastic bag can be OK for a day or two as well.
Good luck. Hope it saves something for you