I've presented game-show-style games at the National Puzzlers' League convention since I started going in
1999. A game that I've done the last few years is called Rebus Remix.
In Rebus Remix, the idea is to use letter tiles, which represent letters, and icon tiles, which represent short words, to spell the answers to clues. Each batch of clues comes with its own tile set. Since I can't really reuse old games, I'm posting the old games here in .pdf form so people who missed them (or couldn't attend con at all) can see them.
Pay attention to the tiles, and remember what they mean as you move from one clue set to the next; they are frequently reused, and each round in the second half contains one tile that you saw in the first half.
These games are good practice in case you get to play Rebus Remix at con in the future.
Tiebreakers that have been used to decide order going from Round 1 to Round 2. Two more have been added in 2012.