Lots of solid useful advice above, Mr. Cheney!! I would confirm and emphasize a few things...
Get the Stan Jones folding (non-laminated) map
in advance -- at least one for each boat you'll be using, and a spare. They are well worth it.
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Rent a good runabout boat! (Note that Bullfrog launch ramp is closed -- you cannot launch your own boat.) As many have said above, it would be a stretch for newbees to run 30 miles from Bullfrog to Escalante on a houseboat ("HB"). Well, it's not impossible but you really don't want to have to re-anchor the HB again and again. Park that dang thing somewhere and use the runabout to explore and visit the marina for ice and supplies. Iceberg Canyon has good possibilities for parking the HB. Be aware that your 80+ passengers may have a little trouble getting in and out of the runabout.
On our first trip in 1987, we dug holes in a sandy beach for anchors ONCE. Never again. Since then, we always pull up to a rocky shore line with huge multi-ton boulders. Throw the anchors around the boulders and you're set.
Another suggestion...park the HB where it will be in the shade of high cliffs for as much of the day as possible, or at least in the afternoon. This will greatly reduce your cooling needs and generator run time. Also, don't park the HB on the open lake! Look for a protected canyon or cove as the wind and waves on the open lake can be ferocious especially in the middle of the night. Use the runabout to scout for a good location.
As the lake continues to drop, you may need to back the HB off occasionally to avoid getting stuck. Pontoon boats tend to get stuck in soft muck at the shoreline. You may have to call for help somehow if you're stuck. Also, you will find there are very limited opportunities for hiking back in the side canyons now because of the mud. It can be knee deep in places!
As long as it's not raining,
the roof of the HB is THE place to sleep! It does start cooling down in September, but if it remains above 75 degrees at night, you'll want a sleeping bag on the roof. There should be plenty of pads provided on the roof that you can use for mattresses.
Ice does go very fast in July/August though it may last a bit longer in September. Back in the olden days when all we had was a propane frig, we would line the bottom of the big double-door ice chest with block ice. Then throw all the drinks in and cover it with ice cubes to the top. Keep the ice chest covered with wet towels any time it's exposed to the sun.
At night, do not leave your gang plank out where mice can easily come aboard. On Day One, go ahead and set at least 2 mouse traps. You will very likely catch some varmits as previous renters always leave the plank out. Mice can also get in on your anchor lines so we always put out plastic baffles made of oversized Frisbees. (Paper plates will not stop them.)
If you will have a runabout with you, bring a sturdy colorful floating rope of about 50 ft length to tow the runabout behind the HB. The rope should have a snap hook on one end to clip to the runabout. Lift the motor on the runabout before towing to reduce drag. Don't back up the HB when the rope is out or you'll surely wrap it around a prop!
When
ANY serious emergency arises, the first order of business is to have everyone put on their life jackets! Bring
small pocket-sized flashlights for each person on board and extra batteries. Also bring one large powerful LED flashlight and binoculars. Note that you'll probably have limited or zero cell phone service once you get away from the marina. Finally, be sure you understand how the VHF radio works.
Have a great safe trip, and report back here when you get home!