If your home is likely to be overcrowded for a family reuninon or similar social event, then consider a local budget hotel.

If however one is planning to put up friends or family due to some emergency, then hotel accomadation is unlikely to be available.
Pre planning is vital, especialy as the emergency may interupt utility service, or result in empty shelves in local stores.

Keep large stocks of non perishable foods
Blankets, linens and pillows.
Plenty of large cooking pots.
Sufficient glases, plates and knives and forks.

Review secure storeage for firearms, liquor, medicines, dangerous tools, and hazardous chemicals.
Remember that those staying with you may be unaware of the hazards in your home. Keeping a loaded gun under the bed and rat poision in the kitchen cupboard MAY be OK normaly but not with visitors.
Consider the risks of utility failure, or the breakdown of a domestic appliance.
You may be able to cook for yourself on a camping stove, but for 16 ? Consider a large camp stove, or two.
What if the washing machine breaks ? for just yourself you could wash by hand or postponne laundry day , but for 16 ?
In a remote area, consider a spare washer, in a town try to keep money to hand for any urgent replacement.

Managing without electricity gets more diffecult, and possibly dangerous with a crowd, a generator is nearly essiential.

Consider spare/additional PCs, TVs, radios etc, old ones are very cheap.

I would certainly with others who suggest an outdoor urinal and shower, and vast supplies of TP.