@Jon2761 A brunch is not a party, and by all accounts it sounds like it is just a gathering of close family & friends who haven't seen each other and were looking forward to a catch up.
The average person may not even be drinking alcohol for a Brunch, it's not like they sound as if they are the full on 'Party' types that you are describing.
Alas, it's your choice who you want in your home.
Be mindful however there are still larger families in the world.
It's been absolutely stupid of those who have put a Median number of people restriction on how many people can live together, or gather etc as it's unrealistic when there's families and living arrangements of all numbers and always has been.
I recall hearing stories of larger families a number of years ago wanting to attend events like the Cinema or events as a "Family" and they were denied the right to attend unless they paid extra as a '"Family" was an average of 2 adults and 3 children at the time...
It pays to be open minded and not assume in life.
I hope your new enquiry is a good choice, do let us know how they are.