I am 100% certain that everyone present has already been heavily exposed to the virus.
Exposed /= infected. As long as one person is contagious, anyone that hasn't been infected yet can get it and continue the spread.
What difference would it make if anyone finds out about it? My mechutonim who are high risk will not be there.
Because people will think that if you are doing it, it's OK if they do. They won't know all the rules you put in place.
The only question is if one additional family that has already been exposed and mostly recovered, will be allowed to participate.
The doctors are not yet certain how long someone remains contagious for, even after symptoms have cleared and are still suggesting isolating unless it is to help an elderly person *who has the virus*