Maybe assign them chores? Clean the kitchen - "Phew, katie, I'm tired. Would you please load the dishwasher, take care of the pots and pans and wipe down the counters? Thanks, I need to sit down for a while" and "Bob, let me show you how our washer and dryer work. Sure do go through alot of towels when you have a pool. You know, it's great we're close enough that we can ask you to help out." and "Bob, Katie, great! your just in time. We're out of ice. The 7-11 is just down the street. I think four or five eight pound bags should fill the coolers."

I have learned that alot of people are willing and happy to pitch in but are completely clueless and need to be shown.

I don't actually know a Bob and Katie, so if you are Bob and Katie, don't be offended. I don't know you. I suppose I just figured out why nobody wants to come to my house anymore.