Just watched an episode of Good Eats / Alton Brown, he did a meat loaf using freshly ground mix of chusck roast and sirloin 50:50. We did a modded version, just ground chusck, Wasa bread crumbs, fresh garlic, fresh onion, etc . . . Check the Food TV > Good Eats page. We packed into a loaf pan, then plopped it out on a parchment paper lined sheet pan and baked it in a 350 oven. Turned out one of the best meatloaf's we've ever had. I'm gonna have to try it in the BSKD
Good luck with the big feed.