We also have had a houseful all summer we are in a holiday hot spot, often one lot arriving before another has left,
but the difference is none of the guests have treated it as a hotel,
they all know it is a busy working time for us, so I always explain I cannot take on any extra effort,
advice would be,
when arranging a visit, be extremely clear you will be busy with work, be clear that you will not be standing on ceremony, it would be lovely to share a meal in the evening, if they want to cook feel free, but clean up afterwards, we do cook for everyone but only if I arrange it in advance, no waiting around for people to turn up.
I go to the beach a lot (surf and kayak), if they want to join me great, if they want to take the children when I am busy great,
if you have been to the beach you come in the back way and all the sand must be rinsed off before you come in, wet suits live outside,
Empty the dishwasher, empty the washing machine clean filters, and sort out your own beds leave ready for the next lot, and use the dyson a lot, and put your children to bed at the same time as I put mine to bed or before. And buy food and wine. If you see something that needs doing do it. thanks.
I am strict, but everyone gets it, they know they are welcome any time as long as they put in effort so I don't have to.
we have had at least two groups at anyone time since the before the children broke up,
I have a summer house with two rooms, a shower and a loo, it has internet, and two caravans at the bottom of the garden, yurts, bell tents and pop up tents have been up and down(we have a small garden)
everyone keeps coming back, so no one minds.