A game of Jeopardy has three contestants.
The contestants dress themselves.
Teachers I would presume.
Jeopardy has had over 9,200 episodes and almost 20,000 contestants and even the Syndicated show has had over 6,200 episodes and over 10,000 contestants
During the commercial break after they find out the category.
They have had a few and will again. Travel to Jeopardy to audition is at a person's own expense.
The Final Jeopardy bets are revealed after the 30 seconds of writing time ends. Before then, the contestants don't know how much the other contestants bet.