Welp, I can provide ideas, at least ones that I've used and have worked in the past couple years for my high school team. I also plan on implementing some of the same ideas with the college bowl team, since there's a good chance I'll end up named IR/assistant coach outside of tournament moderator...
1. Bust out the old tapes *and I know you have some
*. This does not necessarily mean just Jeopardy. This could also be Tic Tac Dough, Joker's Wild, Press Your Luck *all which most of them actually remember*, Millionaire, 21, etc. In particular, I hook up my team's buzzers, stand next to the TV, and have them truly play along. I even have them play an unofficial game of Millionaire, using the official WWTBAM book of full 15 question games they released in 2000.
With Jeopardy, I just pause when someone buzzes in, add or subtract depending on their response, and give others a chance to answer before unpausing and revealing what's correct *of course, I do make sure I know the answers ahead of time too, which doesn't hurt my knowledge base a single bit either
*. You might be surprised how well even some of these high school students do at this...
2. King of the hill: Players go against each other 1vs1, first to buzz-in and answer 3 or 5 *your pref* correct advances to the next round. This continues in a single elimination bit, winner of one match faces winner of another, and whoever is left wins and is "Da King." If you want a prize for the winner, go for it. Make 'em really feel like a king...
3. Trash packets: People of all ages love this stuff. Who knows when it might come up too? Do a search online for "quiz bowl trash packets." I prefer this site, where I have about 200 MB's of word files full of questions, alone:
http://quizbowl.stanford.edu/archive/4. Mock games: Much like what Odor said, if you can get some mock games going that can be advertised around campus *the ones here play similarily to the King of the Hill format, and the prizes for 1st and 2nd are also sponsored by the SGA so it's not all just quiz bowl*, you'll become more known. Give the more senior members some reason to feel like their spot is in Jeopardy, and you may see them perk up a bit.
5. Parents/Teachers vs. Students: BWAHAHAHAHA. Invite some profs or parents *who you have a good relationship with, of course, lol* to play against the students *make sure they know what they're doing first too, lol*. 99% of the time, the teachers and parents are amazed at how difficult it is, how well the youngins are doing, and the students get major bragging rights *I'M SMARTER THAN MY TEACHER, W00t*, that up their enthusiasm/confidence/etc etc yadda yadda.
6. Honors Program: If you establish an ongoing relationship with the students and leads of Honors, your name will be spread amongst the academia of the school, which is what you're ultimately aiming for. Our new head coach here at MD is the chair of the Honors Program, and in our first two nights of campus tournaments alone, we had over 50 people attend and play games.
In the end, variety is key. If I think of anything else, I'll let you know.